The correct answer is option 4, Planning Commission. The question asks which institution is not provided in the constitution.

- Option 1, Election Commission, is provided in the constitution and is responsible for conducting free and fair elections in India.

- Option 2, Finance Commission, is also provided in the constitution and is responsible for recommending the distribution of finances between the central government and the state governments.

- Option 3, Public Service Commission, is also provided in the constitution and is responsible for recruitment and appointments to the civil services.

However, option 4, Planning Commission, is not mentioned in the constitution. The Planning Commission was a non-constitutional and non-statutory body that was responsible for formulating Five-Year Plans for economic development in India. It was replaced by the NITI Aayog in 2015.