**Core Concept**
The question requires knowledge of vaccine types and their indications, specifically in the context of post-exposure prophylaxis (PEP) for rabies. Rabies vaccination is crucial in preventing the development of rabies after exposure to the virus.

**Why the Correct Answer is Right**
The correct answer is **C. HDCV (Human Diploid Cell Vaccine)**. HDCV is a type of inactivated rabies vaccine used for post-exposure prophylaxis. It is administered intramuscularly to individuals who have been bitten or exposed to rabies virus, either through animal bites or laboratory exposure. HDCV works by inducing the production of neutralizing antibodies against the rabies virus, thereby preventing the virus from replicating and causing disease.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a recognized vaccine type for rabies.
* **Option B:** This option is not a vaccine, but rather a treatment for rabies post-exposure.
* **Option D:** This option is a different type of vaccine, but not used for rabies post-exposure prophylaxis.

**Clinical Pearl / High-Yield Fact**
In the event of a suspected rabies exposure, prompt administration of HDCV is critical in preventing the development of rabies. The World Health Organization recommends immediate washing of the wound with soap and water, followed by administration of HDCV and passive immunization with rabies immunoglobulin.

**Correct Answer: C. HDCV (Human Diploid Cell Vaccine)**