**Core Concept**
Ischemic necrosis in alkali burn refers to the tissue death caused by the loss of blood supply to the affected area due to damage to the small blood vessels, leading to a decrease in oxygen and nutrient delivery.

**Why the Correct Answer is Right**
The correct answer is based on the pathophysiology of alkali burns. Alkali substances, such as sodium hydroxide, can cause severe damage to tissues by denaturing proteins and disrupting cellular membranes. This damage leads to the activation of various inflammatory pathways and the release of pro-inflammatory mediators. As a result, there is an increase in vascular permeability, edema, and ultimately, ischemia due to the compromise of blood flow to the affected area. The ischemia leads to tissue necrosis, which is characterized by coagulative necrosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the type of tissue death that occurs in alkali burns. Liquefactive necrosis is typically seen in infections or infarctions.
**Option B:** This option is incorrect because it does not accurately describe the type of tissue death that occurs in alkali burns. Fat necrosis is typically seen in pancreatitis or trauma to fatty tissues.
**Option C:** This option is incorrect because it does not accurately describe the type of tissue death that occurs in alkali burns. Caseous necrosis is typically seen in tuberculosis.

**Clinical Pearl / High-Yield Fact**
It is essential to note that alkali burns can cause severe damage to tissues, leading to long-term complications such as chronic pain, scarring, and vision loss. Prompt medical attention is crucial in preventing further damage and promoting healing.

**Correct Answer: C. Coagulative necrosis.**