**Core Concept**
Autopsy refers to the post-mortem examination of a body to determine the cause and manner of death. It is a fundamental procedure in forensic medicine, involving a systematic investigation of internal organs and tissues. The term is often used interchangeably with "necropsy," which is the standard medical term for such an examination.

**Why the Correct Answer is Right**
Biopsy involves the removal of a small tissue sample from a living patient for pathological examination, typically to diagnose diseases in a living body. Unlike autopsy, which occurs after death and examines the entire body, biopsy is performed in a living individual. Therefore, biopsy is not a synonym for autopsy and does not describe a post-mortem examination.

**Why Each Wrong Option is Incorrect**
Option A: Obduction is a rare, archaic term used in some legal or forensic contexts to refer to a post-mortem examination, though it is not common. It is occasionally used synonymously with autopsy in older texts.
Option B: Necropsy is the standard medical term for autopsy and is widely accepted in forensic medicine.
Option D: Postmortem examination is the formal, correct description of an autopsy and is used in official reports.

**Clinical Pearl / High-Yield Fact**
Remember: **Autopsy = post-mortem examination**, **Necropsy = autopsy**, and **Biopsy = tissue sample from a living person**. Confusing these leads to incorrect answers in forensic medicine questions.

✓ Correct Answer: C. Biopsy