Yes, a medical student (MD/MS) or someone pursuing residency can appear for the UPSC exam. There are no restrictions on educational background for UPSC aspirants.

Most government medical colleges in India require students to sign a service bond after completing their MD/MS or residency. This bond typically mandates serving in government hospitals for a specific period (often 2-3 years) in exchange for the subsidized education received.

If you get selected for UPSC in the middle of your MD/MS or residency, you need to negotiate with the medical college administration.

In some cases, the college might be stricter and require you to complete the entire service bond before joining the civil service.

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I hope it helps!