Correct Option: A

Subhash Chandra Bose addressed Gandhiji as the "Father of the Nation" for the first time. Mahatma Gandhiji is revered in India as the Father of the Nation. Much before the Constitution of Free India conferred the title of the Father of the Nation upon the Mahatma, it was Netaji Subhash Chandra Bose who first adressed him as such in his condolence message to the Mahatma on the demise of Kasturba.