**Core Concept**
Postmortem caloricity refers to the phenomenon of the body temperature remaining elevated or even increasing after death. This occurs due to the ongoing metabolic processes in the body's tissues, particularly in the muscles, after the cessation of blood circulation and respiration.

**Why the Correct Answer is Right**
The correct answer is associated with conditions where the body's metabolic processes continue unabated, leading to elevated body temperature post-mortem. In such cases, the breakdown of glycogen stores in the muscles leads to the production of lactic acid, which in turn causes a rise in body temperature. This phenomenon is often seen in cases of hyperthermia, malignant hyperthermia, or conditions where there is a significant breakdown of muscle tissue.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because postmortem caloricity is not typically associated with conditions involving hypothermia, where the body temperature is actually lowered due to external factors.

**Option B:** This option is incorrect because while certain infections can cause a rise in body temperature, postmortem caloricity specifically refers to the phenomenon occurring after death, not as a result of an ongoing infection.

**Option C:** This option is incorrect because while certain conditions involving muscle breakdown can lead to postmortem caloricity, this is not the primary condition associated with this phenomenon.

**Clinical Pearl / High-Yield Fact**
Postmortem caloricity is a critical forensic indicator that can help differentiate between death due to natural causes and death due to other factors, such as poisoning or trauma. It is essential for forensic pathologists to consider this phenomenon when investigating the cause of death.

**Correct Answer: C. Malignant Hyperthermia.**