Who among the following is known as Grand Old Man of India?

Dadabhai Naoroji was known as the 'Grand Old Man of India' for his pioneering role in the Indian independence movement. He was the first Indian to be elected to the British Parliament and authored 'Poverty and Un-British Rule in India', which explained the economic drain caused by colonial rule. Gandhi, Nehru, and Tagore, though iconic leaders, had different epithets.