A general election to the National or Provincial Assembly must be held within _ days after expiry of its term.

The correct answer is 60 days. According to Article 224(1) of the Constitution of Pakistan, a general election to the National or a Provincial Assembly must be held within 60 days after the expiry of its term. This constitutional provision ensures a timely and smooth transition of power following the completion of an assembly's tenure.

• 90 days is incorrect; 90 days is the period for holding elections if an assembly is dissolved prematurely.
• 30 days is incorrect as it is too short a period for election preparations.
• 120 days is incorrect as it exceeds the constitutionally mandated timeframe, which could lead to a constitutional vacuum.