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Option 1: B. Shiva Rao - B. Shiva Rao was not the advisor to the Drafting Committee of the Constituent Assembly. This option is incorrect.
Option 2: Dr. B.R. Ambedkar - Dr. B.R. Ambedkar was a prominent member of the Constituent Assembly and the Chairman of the Drafting Committee. While he played a vital role in drafting the Constitution, he was not an advisor to the committee. This option is incorrect.
Option 3: Sachidananda Sinha - Sachidananda Sinha was the first President of the Constituent Assembly but he was not the advisor to the Drafting Committee. This option is incorrect.
Option 4: B.N. Rau - B.N. Rau was appointed as the Constitutional Advisor to the Constituent Assembly and served as the advisor to the Drafting Committee from 1947 to 1949. He provided expert guidance and legal expertise in drafting the Constitution. This option is correct.
Therefore, the correct answer is option 4. B.N. Rau was the advisor to the Drafting Committee of the Constituent Assembly.