Why Correct: Rabindranath Tagore wrote India's national anthem 'Jana Gana Mana' and Bangladesh's national anthem 'Amar Shonar Bangla'. He is the only person to have authored the national anthems of two countries.
Distractor Analysis: Bankim Chandra Chattopadhyay wrote 'Vande Mataram', which is the national song of India but not the national anthem. Kazi Nazrul Islam is the national poet of Bangladesh and wrote many songs, but not any national anthem. Muhammad Iqbal wrote 'Saare Jahan se Accha' and inspired Pakistan's national anthem lyrics, but he did not write the anthem itself.
Takeaway: Remember that Tagore and Pakistan's anthem writer (Hafeez Jullundhri) are different. Bangladesh's anthem is also by Tagore, making him unique.