The planning commission of India is

Tripura
Meghalaya
Mizoram
Manipur

The correct answer is: The planning commission of India is not a state.

The Planning Commission of India was an apex body of the Government of India that was responsible for formulating India’s Five-Year Plans. It was established in 1950 and abolished in 2014.

The Planning Commission was not a state because it was not a constituent unit of the Indian Union. It was an advisory body to the Government of India and had no executive powers.

The Planning Commission was abolished in 2014 and its functions were transferred to the National Institution for Transforming India (NITI Aayog).

The NITI Aayog is a policy think tank that was established in 2015. It is headed by the Prime Minister of India and has a Governing Council that includes the Chief Ministers of all the states and the Lieutenant Governors of all the Union Territories.

The NITI Aayog is responsible for formulating India’s long-term development strategies and for coordinating the implementation of these strategies by the Central and State Governments.

The NITI Aayog is a non-statutory body and does not have any executive powers. However, it has been playing a significant role in shaping India’s development policies.