Why Correct: Sardar Vallabhbhai Patel earned the title 'Iron Man of India' for his decisive role in integrating over 560 princely states into the Indian Union after independence.
Distractor Analysis: Jawaharlal Nehru served as India's first Prime Minister and is often called the 'Architect of Modern India'. Mahatma Gandhi led India's independence movement through non-violence and is known as the 'Father of the Nation'. Subhas Chandra Bose founded the Indian National Army and is remembered as 'Netaji'.
Takeaway: Patel also served as India's first Deputy Prime Minister and Home Minister, and his birthday (31 October) is celebrated as National Unity Day.

Why Correct: Sardar Vallabhbhai Patel earned the title 'Iron Man of India' for his decisive role in integrating over 560 princely states into the Indian Union after independence through political negotiation and firm administration.
Distractor Analysis: Surendranath Banerjee founded the Indian National Association and was an early moderate leader. Bipin Chandra Pal was a radical nationalist and part of the Lal-Bal-Pal triumvirate. Lala Lajpat Rai, also part of Lal-Bal-Pal, led protests against the Simon Commission and was called 'Punjab Kesari' (Lion of Punjab).
Takeaway: Patel also served as India's first Deputy Prime Minister and Home Minister, and his birthday (31st October) is observed as National Unity Day (Rashtriya Ekta Diwas).

Why Correct: The Chamber of Princes, also known as the Narendra Mandal, was established in 1920 by a royal proclamation of King George V. It served as a consultative and advisory body for the princely states of British India.
Distractor Analysis: 1858 marks the year the British Crown took direct control of India after the Revolt of 1857, not the establishment of the Chamber. 1915 is the year of the founding of the Home Rule League by Bal Gangadhar Tilak and Annie Besant, not the Chamber. 1947 is the year of Indian independence and the integration of princely states, not the establishment of the Chamber.
Takeaway: The Chamber of Princes was inaugurated in 1921 and consisted of 108 members from the princely states. It was dissolved after Indian independence in 1947, when the princely states acceded to the Dominion of India.

Why Correct: Operation Polo was the code name for the Indian Armed Forces' action in September 1948 that led to the annexation of the princely state of Hyderabad into the Indian Union. The operation was launched after the Nizam of Hyderabad refused to accede to India, and it resulted in the end of Nizam's rule and the integration of Hyderabad.
Distractor Analysis: Kashmir's accession to India in October 1947 was through the Instrument of Accession signed by Maharaja Hari Singh, not through a military operation named Operation Polo. Junagadh was integrated into India in 1948 through a plebiscite and police action, but the operation was not called Operation Polo; it was a separate accession process. Jodhpur was a princely state in Rajasthan that acceded to India peacefully in 1947 without any military operation.
Takeaway: Operation Polo was named after the polo player, as the Nizam of Hyderabad was a famous polo enthusiast. The operation was led by Major General J.N. Chaudhuri and lasted about five days, from 13 to 18 September 1948. Other military operations include Operation Vijay (Goa, 1961) and Operation Meghdoot (Siachen, 1984).