**Core Concept**
Cadaveric lividity, also known as post-mortem lividity, refers to the discoloration of the skin in a deceased individual due to the settling of blood in the dependent parts of the body. This phenomenon occurs as a result of the cessation of blood circulation, leading to the pooling of blood in the areas of the body that are in contact with the ground or surface.

**Why the Correct Answer is Right**
When an individual dies, the heart stops pumping blood, and gravity causes the blood to settle in the dependent parts of the body. This results in the characteristic purplish discoloration of the skin, which is most pronounced in areas such as the buttocks, back, and lower extremities. The blood settles due to the hydrostatic pressure exerted by gravity on the blood vessels, causing the blood to leak out of the vessels and accumulate in the surrounding tissues.

**Why Each Wrong Option is Incorrect**
**Option A:** Putrefaction refers to the decomposition of tissues in a deceased individual, which is a separate process from cadaveric lividity.
**Option B:** Hemolysis is the breakdown of red blood cells, which can cause discoloration but is not directly related to cadaveric lividity.
**Option C:** Congestion refers to the accumulation of blood in the tissues due to various pathological processes, such as inflammation or infection, but is not synonymous with cadaveric lividity.

**Clinical Pearl / High-Yield Fact**
Cadaveric lividity can be used as an indicator of the position of the body at the time of death, as the blood settles in the dependent parts of the body.

**Correct Answer: D. Post-mortem lividity. Post-mortem lividity.**