Explanation:
The Drafting Committee of the Constituent Assembly was responsible for drafting the Indian Constitution. It consisted of seven members who were entrusted with the task of formulating the final document. Among the given options, B.N. Rao was not a member of the Drafting Committee.

Members of the Drafting Committee:
The members of the Drafting Committee were as follows:

1. B.R. Ambedkar: Dr. B.R. Ambedkar was the Chairman of the Drafting Committee. He played a pivotal role in drafting the Constitution and is often referred to as the "Architect of the Indian Constitution."

2. N. Gopalaswami Ayyangar: N. Gopalaswami Ayyangar was a prominent lawyer and politician from Madras. He was a member of the Constituent Assembly and served on the Drafting Committee.

3. K.M. Munshi: K.M. Munshi was a lawyer, writer, and politician from Gujarat. He was known for his contributions to the literary world as well as his political career. Munshi was also a member of the Drafting Committee.

4. Muhammad Saadullah: Muhammad Saadullah was a prominent leader from Assam. He served as the Prime Minister of Assam and was a member of the Constituent Assembly. Saadullah was also a member of the Drafting Committee.

5. Alladi Krishnaswami Ayyar: Alladi Krishnaswami Ayyar was a renowned lawyer and politician from Madras. He was one of the prominent legal minds involved in drafting the Constitution and served on the Drafting Committee.

B.N. Rao:
B.N. Rao, or Benegal Narsing Rau, was an eminent civil servant and diplomat. He played a crucial role in the framing of the Indian Constitution but was not a member of the Drafting Committee. However, he was appointed as the Constitutional Advisor to the Constituent Assembly and provided valuable guidance and assistance in the drafting process.

In conclusion, among the given options, B.N. Rao was not a member of the Drafting Committee of the Constituent Assembly. However, his contributions as the Constitutional Advisor were significant in shaping the Indian Constitution.