“Gold Tranche” (Reserve Tranche) refers to

The correct answer is D. The Gold Tranche, now called the Reserve Tranche, is the part of a member's IMF quota that it paid in reserve assets (originally gold, later SDRs or hard currency). Because the member is drawing on its own money, it can use this portion without IMF conditionality and without interest charges. It is therefore a credit facility granted by the IMF, though the drawing is really access to the member's own reserve position.

Why the others fail:

• A is wrong. The World Bank lends for development projects, through IBRD and IDA, and these loans come with project conditions. The Gold Tranche is an IMF concept.
• B is wrong. Central banks conduct operations like open market operations, the bank rate and CRR changes. The Gold Tranche is a member's position in the IMF, not a central bank tool.
• C is wrong. The WTO is a trade body that runs dispute settlement and negotiations. It does not extend credit to members.

Concept: quota-based IMF financing, with reserve tranche and upper credit tranches. For Mains, it links to balance of payments support and the conditionality debate on IMF programmes. Note that since the Second Amendment to the IMF Articles (1978), gold no longer forms part of quota payments, so the term Reserve Tranche is now the accurate one.

Trap: the word "gold" leads many aspirants to pick a central bank or commodity-linked option. The tranche is a feature of IMF quota, not a gold-based scheme.