**Core Concept**
Hypostasis refers to the post-mortem settling of blood and fluids in the body, particularly in the dependent parts, due to gravity. This phenomenon occurs after death and is an important consideration in forensic pathology and autopsy procedures.

**Why the Correct Answer is Right**
Hypostasis is caused by the breakdown of the blood's cellular components and the release of cellular enzymes, which leads to the coagulation of blood and its subsequent settling in the dependent parts of the body. The process is influenced by factors such as the time elapsed since death, the ambient temperature, and the presence of any anticoagulants. The correct answer choice should accurately reflect the underlying mechanisms and principles governing hypostasis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be incorrect if it contradicts the established understanding of hypostasis as a post-mortem process or fails to account for the role of gravity in fluid settling.

**Option B:** This option might be incorrect if it suggests that hypostasis is a reversible process or can be prevented by manipulating factors such as temperature.

**Option C:** This option might be incorrect if it implies that hypostasis is a normal physiological process or occurs in living individuals.

**Clinical Pearl / High-Yield Fact**
In forensic pathology, the presence and distribution of hypostasis can provide valuable information about the position of the body at the time of death, the time elapsed since death, and the environmental conditions surrounding the body.

**Correct Answer: C. Hypostasis is a post-mortem phenomenon.**