Option 1: B. N. Rau

B. N. Rau was indeed the advisor to the Constituent Assembly. He was a renowned Indian Civil Servant and jurist. Rau played a crucial role in providing legal expertise and guidance during the drafting of the Indian Constitution. As the Constitutional Advisor, he provided valuable inputs on various legal matters, constitutional principles, and the harmonization of diverse opinions within the Constituent Assembly.

Option 2: B. R. Ambedkar

B. R. Ambedkar was not the advisor to the Constituent Assembly, but he played a significant role in the drafting of the Constitution as the Chairman of the Drafting Committee. He had a profound influence on shaping and formulating the fundamental rights, social justice, and equality provisions in the Constitution.

Option 3: Pattabhi Sitaramayya

Pattabhi Sitaramayya was not the advisor to the Constituent Assembly. He was a freedom fighter and a member of the Indian National Congress. While he played an active role during the Indian independence movement, he was not directly involved in the constitutional drafting process.

Option 4: Alladi Krishnaswamy

Similar to the previous options, Alladi Krishnaswamy was not the