**Core Concept**
Adipocere, also known as corpse wax, is a result of the hydrolysis of fats in the body. It occurs due to the breakdown of triglycerides in subcutaneous fat and adipose tissue by enzymes such as lipase and phospholipase, in the presence of moisture and oxygen.

**Why the Correct Answer is Right**
Adipocere formation is a process that typically occurs in bodies that have been submerged in water or exposed to high humidity, allowing the lipids to break down and re-solidify into a waxy substance. This process is facilitated by the presence of bacterial enzymes and the acidic environment, which helps to break down the triglycerides into fatty acids and glycerol. The resulting adipocere can be a pale yellow or white, waxy material that resembles soap.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because adipocere formation is not typically associated with dry or arid environments.
**Option B:** This option is incorrect because adipocere is not a product of protein metabolism, but rather the breakdown of fats.
**Option C:** This option is incorrect because adipocere is not a normal process in living organisms, but rather a post-mortem change.

**Clinical Pearl / High-Yield Fact**
It's essential to note that adipocere formation can be a critical clue in forensic pathology, as it can help determine the circumstances of death, such as whether the body was submerged in water.

**Correct Answer: C. Post-mortem change in bodies exposed to water.**