**Core Concept**
Sperm capacitation is a physiological process that prepares spermatozoa for fertilization by allowing them to bind to and penetrate the zona pellucida of the oocyte. This process involves changes in the sperm membrane, particularly the loss of cholesterol and the increase of calcium ions.

**Why the Correct Answer is Right**
Sperm capacitation occurs in the female reproductive tract, specifically in the fallopian tube, where the spermatozoa are exposed to high concentrations of bicarbonate ions and calcium. The increase in calcium ions triggers a series of cellular changes, including the hyperactivation of motility and the acrosome reaction, which enables the sperm to penetrate the zona pellucida and fertilize the oocyte. The capacitation process is essential for successful fertilization and is influenced by factors such as the presence of seminal plasma and the pH of the reproductive tract.

**Why Each Wrong Option is Incorrect**
**Option A:** Sperm capacitation does not occur in the epididymis, as the spermatozoa are still immaturity and require further maturation in this location.
**Option B:** The seminal vesicles contribute to the seminal plasma, but they are not the site of sperm capacitation.
**Option C:** The testes produce spermatozoa, but they are not the site of capacitation.

**Clinical Pearl / High-Yield Fact**
Sperm capacitation is a critical step in fertilization, and any factors that disrupt this process can lead to infertility. Understanding the mechanisms of sperm capacitation is essential for the diagnosis and treatment of male infertility.

**Correct Answer: C. Fallopian tube**