Who was the Provisional President of the Constituent Assembly before Dr. Rajendra Prasad took over?

Who was the Provisional President of the Constituent Assembly before Dr. Rajendra Prasad took over?

(a) C.C. Rajagopalachari
(b) Dr. B.R. Ambedkar
(c) T.T. Krishnamachari
(d) Dr. Sachchidananda Sinha

Correct Answer: (d) Dr. Sachchidananda Sinha

Explanation:
Dr. Sachchidananda Sinha was the Provisional President of the Constituent Assembly before Dr. Rajendra Prasad took over as the permanent President.
Possible Sources: Historical records of the Constituent Assembly of India.