**Question:** Coagulative necrosis is seen in -

A. Hypothermia
B. Hyperthermia
C. Hypoxia
D. Ischemia

**Core Concept:**
Coagulative necrosis is a pathological process characterized by the destruction of tissue due to a localised loss of cellular function caused by a specific insult. It is distinct from other forms of necrosis, such as toxic necrosis or hypotensive necrosis. This question tests the understanding of the different types of necrosis and their underlying causes.

**Why the Correct Answer is Right:**
Coagulative necrosis, also known as ischemic necrosis, occurs when there is a reduction in blood flow to a tissue, leading to ischemia. This reduced blood flow results in oxygen and nutrient deprivation, which eventually causes cellular damage and tissue death. In this case, the correct answer is D. Ischemia, as it is a condition where a tissue is deprived of its required oxygen and nutrients, leading to coagulative necrosis.

**Why Each Wrong Option is Incorrect:**
A. Hypothermia (low body temperature) does not directly cause necrosis, but it may lead to secondary complications that could potentially result in necrosis, but it is not the primary cause of coagulative necrosis.
B. Hyperthermia (high body temperature) can lead to thermal necrosis, a type of necrosis caused by excessive heat, but it is distinct from coagulative necrosis.
C. Hypoxia (low oxygen levels) can contribute to tissue damage, but it is not the primary cause of coagulative necrosis. Coagulative necrosis is primarily caused by ischemia, which is a result of hypoxia.

**Clinical Pearl:**
Understanding the different types of necrosis is crucial for accurate diagnosis and treatment planning. Coagulative necrosis, also seen in acute myocardial infarction, is vital for recognizing and treating ischemic conditions.

**Correct Answer:** D. Ischemia