**Core Concept**
Apoptosis, or programmed cell death, is a critical mechanism regulating tissue homeostasis and eliminating damaged or unwanted cells. Anti-apoptotic genes encode proteins that inhibit or suppress this process, thereby promoting cell survival. In contrast, pro-apoptotic genes facilitate apoptosis, leading to cell death.

**Why the Correct Answer is Right**
Bcl-2 (B-cell lymphoma 2) is a well-characterized anti-apoptotic gene that encodes a protein inhibiting the mitochondrial outer membrane permeabilization (MOMP) step in the apoptosis cascade. Bcl-2 acts by binding to and inhibiting the pro-apoptotic Bax protein, thus preventing the release of cytochrome c from the mitochondria and subsequent activation of the caspase cascade. This results in cell survival and inhibition of apoptosis.

**Why Each Wrong Option is Incorrect**
**Option A:** C-myc is a proto-oncogene that promotes cell proliferation and is often associated with cancer. While it can contribute to cell survival, it is not considered a classical anti-apoptotic gene like bcl-2.

**Option B:** p53 is a tumor suppressor gene that, under normal circumstances, promotes cell cycle arrest and apoptosis in response to DNA damage. It is a pro-apoptotic gene, not anti-apoptotic.

**Option D:** Bax (Bcl-2-associated X protein) is a pro-apoptotic gene that promotes apoptosis by facilitating MOMP and releasing cytochrome c from the mitochondria. It is the opposite of bcl-2 in its function.

**Clinical Pearl / High-Yield Fact**
The Bcl-2 family of proteins plays a crucial role in regulating apoptosis and is often dysregulated in various cancers, including follicular lymphoma, where bcl-2 is overexpressed due to the t(14;18) chromosomal translocation.

**✓ Correct Answer: C. bcl-2**