**Core Concept**
Hirsutism is a condition characterized by excessive hair growth in women in a male pattern, typically involving the face, chest, and back. It is often caused by an excess of androgens, such as testosterone. This condition can be a side effect of certain medications.

**Why the Correct Answer is Right**
The correct answer is an antipsychotic medication known as **Haloperidol**. Haloperidol is a typical antipsychotic that blocks dopamine receptors in the brain. One of the side effects of haloperidol is hyperprolactinemia, which can lead to an increase in androgen levels, causing hirsutism. This is because prolactin inhibits the production of gonadotropin-releasing hormone (GnRH), leading to a decrease in luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels, resulting in an increase in testosterone levels.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a known cause of hirsutism.
* **Option B:** This option is incorrect because it is not a medication commonly associated with hirsutism.
* **Option D:** This option is incorrect because it is not a known cause of hirsutism.

**Clinical Pearl / High-Yield Fact**
It's worth noting that hirsutism can also be caused by other medications such as anabolic steroids, danazol, and certain antidepressants like phenothiazines.

**Correct Answer: C. Haloperidol**