Explanation:

Let’s break each option down for clarity:

- Wheat: This is usually an intermediate good because it's bought by flour mills or bakeries to turn into flour or bread—so it’s not directly for final consumption.

- Gold: Here’s the thing—gold usually isn’t an intermediate good. People buy gold as jewelry, for investment, or sometimes as a final product (like coins). So, it often counts as a final good.

- Service of Doctor: This definitely isn’t an intermediate good. When you pay for a doctor visit, that’s the end use of the service. There’s no further transformation or resale.

- Sand and Bricks: These are classic intermediate goods, mainly bought by construction companies to build houses, roads, etc.—not for your living room shelf.

The takeaway: Among the options, the service of a doctor isn’t an intermediate good. That one stands apart.