**Core Concept**
The CD-95 molecule, also known as Fas, is a death receptor that plays a crucial role in the regulation of apoptosis (programmed cell death) in the immune system. It is a type of tumor necrosis factor receptor (TNFR) that triggers a cascade of intracellular signaling events leading to cell death.

**Why the Correct Answer is Right**
The correct answer is related to the function of CD-95 as a death receptor. When CD-95 binds to its ligand, FasL, it activates a caspase cascade, ultimately leading to the activation of caspase-8 and the execution of cell death. This process is crucial for maintaining immune homeostasis and preventing excessive immune responses. The CD-95 pathway is also involved in the regulation of immune cell populations, such as T cells and natural killer cells.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because CD-95 is not a marker of cell proliferation. While cell proliferation is an important aspect of immune responses, CD-95 is specifically involved in the regulation of apoptosis.
* **Option B:** This option is incorrect because CD-95 is not a marker of inflammation. While inflammation is a key aspect of immune responses, CD-95 is specifically involved in the regulation of apoptosis, which is distinct from inflammatory processes.
* **Option C:** This option is incorrect because CD-95 is not a marker of cell survival. While cell survival is an important aspect of immune responses, CD-95 is specifically involved in the regulation of apoptosis, which is distinct from cell survival mechanisms.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the CD-95 pathway is a key regulator of immune cell homeostasis and can be targeted in cancer therapy to promote apoptosis in malignant cells. Understanding the role of CD-95 in apoptosis is crucial for the development of novel cancer therapies.

**Correct Answer: D. Apoptosis. Apoptosis**