## Core Concept
The process of putrefaction involves the breakdown of tissues by bacteria, typically those from the gastrointestinal tract. The rate of putrefaction can vary depending on several factors, including environmental conditions and the presence of bacteria in different organs.

## Why the Correct Answer is Right
The brain, due to its high lipid content and the presence of digestive enzymes, usually putrefies quickly. Similarly, the gastrointestinal tract, being rich in bacteria, also decomposes rapidly. The liver, with its rich blood supply and enzymatic content, decomposes early as well. In contrast, the **prostate gland** is known for being relatively resistant to putrefaction. This is attributed to its fibromuscular structure and lower bacterial content compared to other organs.

## Why Each Wrong Option is Incorrect
- **Option A:** The brain putrefies quickly due to its high lipid content and enzymatic activity.
- **Option B:** The liver also decomposes early because of its rich blood supply and high enzymatic activity.
- **Option C:** While specific details about this option are not provided, any other organ listed would likely decompose at a different rate based on its bacterial load, enzymatic activity, and structural composition.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the **prostate gland** is often one of the last organs to undergo putrefaction. This fact can be relevant in forensic pathology, where the condition of organs can help estimate the post-mortem interval.

## Correct Answer: D. Prostate.