**Question:** All the following organs likely undergo coagulative necrosis except ?

A. Liver
B. Heart
C. Kidney
D. Brain

**Core Concept:**
Coagulative necrosis is a type of cell death characterized by the formation of clots and the release of inflammatory mediators. It typically occurs due to ischemia, hypoxia, or direct tissue injury.

**Why the Correct Answer is Right:**
The correct answer, **D. Brain**, is correct because the brain is highly organized and protected by the skull and cerebrospinal fluid. Unlike other organs, the brain has a limited capacity for autoregulation and does not undergo coagulative necrosis easily due to its unique physiology and protective mechanisms.

**Why Each Wrong Option is Incorrect:**
A. Liver: Although liver cells can be damaged, they can regenerate and repair themselves, making coagulative necrosis less likely.
B. Heart: Coagulative necrosis is possible in the heart, particularly in the context of myocardial infarction (heart attack) due to occlusion of coronary arteries.
C. Kidney: Kidney cells can regenerate, but necrosis can still occur due to various causes like ischemia, infection, or nephrotoxic drugs.

**Clinical Pearl / High-Yield Fact:**
The term "coagulative necrosis" is derived from the presence of fibrin clots during the necrotic process. Understanding the reasons for the correct answer helps in recognizing the differential diagnosis of necrosis in various organs and conditions.

**Correct Answer:** D. Brain