Answer : 4. "Rajasthan"
Explanation :

1. The provisions related to Panchayati Raj have been discussed in the original Constitution under Part 9 by the 73rd Constitutional Amendment Act, 1992 (Article 243). Part 9, under the heading ‘Panchayats’, contains provisions related to Panchayati Raj up to Articles 243-243O (243-243O).

2. Panchayati Raj Day is celebrated every year on 24 April in India as the foundation of democracy.

3. The Panchayati Raj system is the system of local self-government in rural India.

4. The Panchayati Raj system was implemented by the then Prime Minister Jawaharlal Nehru in Bagdhari village of Nagaur district of Rajasthan on 2 October 1959.

5. Local government form was first adopted in the states of Rajasthan and Andhra Pradesh.