From the options given below, choose the one which can substitute the given expression-

Operation of the human body after the death of a person.

Post-mortem

The correct answer is Option (3) → Post-mortem

A post-mortem is a medical examination of a body after death to determine the cause of death.

Option (1) → Obituary: A published notice or article about a person's death, usually with a brief biography.
Option (2) → Homage: A show of respect or tribute, not related to medical procedures after death.
Option (4) → Mortuary: A place where dead bodies are kept before burial or cremation, not the operation itself.