_____________ was the last deputy chairman of the Planning Commission.

Correct option is A

Shri Montek Singh Ahluwalia was the last Deputy Chairman of the Planning Commission of India. He served from 2004 until the Planning Commission was replaced by the NITI Aayog in 2015.
Important Key Points:
1. Montek Singh Ahluwalia: Last Deputy Chairman of the Planning Commission.
2. Planning Commission: Central institution for economic planning and policy-making.
3. Tenure: Served from 2004 to 2015.
4. Economic reforms: Played a significant role in shaping India's economic policies.
5. Transition to NITI Aayog: Planning Commission was replaced in 2015.
6. Legacy: Contributed to India's economic development and policy framework.
Knowledge Booster:
 Vinay Kohli (b): Incorrect, not a Deputy Chairman of the Planning Commission.
 R.P. Sinha (c): Incorrect, not a Deputy Chairman of the Planning Commission.
 Shyamal Ghosh (d): Incorrect, not a Deputy Chairman of the Planning Commission.