Yes, a person doing an MD/MS residency program can absolutely appear for the UPSC exam. There are no restrictions on educational background for UPSC aspirants. However, there are some important considerations regarding the service bond if you get selected for a civil service position.

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.

They might allow you to leave after fulfilling a portion of the bond. hey might grant a leave of absence to pursue your civil service career while the bond remains in effect. You'd need to return and complete the service bond later. In some cases, the college might be stricter and require you to complete the entire service bond before joining the civil service.

https://competition.careers360.com/exams/upsc-cse

I hope it helps!