When was the third tier added to Indian Federal System?

The answer is C) 1992. Parliament passed the 73rd and 74th Constitutional Amendment Acts in December 1992. They gave constitutional status to Panchayati Raj (Part IX, Article 243) and urban local bodies (Part IXA, Article 243Q), creating the third tier of government below the Union and the States.

• Option A (1990) is wrong. No amendment was enacted that year. Earlier committees such as Ashok Mehta (1978), G.V.K. Rao (1985) and L.M. Singhvi (1986) only recommended local government reform.
• Option B (1991) is wrong. The Bill was introduced in 1991 but lapsed, and it was reintroduced and enacted only in 1992.
• Option D (1993) is the trap. The Acts received presidential assent in April 1993 and came into force on 24 April 1993 (Panchayats) and 1 June 1993 (Municipalities). These are commencement dates, not the year of enactment.

Core concept: constitutional decentralisation, with the Eleventh and Twelfth Schedules listing 29 and 18 subjects for local bodies. For Mains, link this to fiscal federalism, State Finance Commissions and the weak devolution of functions and funds to local bodies.

Trap: choosing 1993 because the institutions became operational that year. For constitutional amendment questions, check whether the question asks about enactment or commencement.