Who was the chairman of Drafting committee for framing the Constitution?

Dr Bhim Rao Ambedkar

The correct answer is Option 1- Dr Bhim Rao Ambedkar

Ambedkar had been a political opponent of the Congress; but, on the advice of Mahatma Gandhi, he was asked at Independence to join the Union Cabinet as law minister. In this capacity, he served as Chairman of the Drafting Committee of the Constitution.