**Core Concept**
Hirsutism is a clinical condition characterized by excessive hair growth in women, particularly in androgen-dependent areas such as the face, chest, and back. This condition is often associated with an excess of androgens, which can be caused by various factors, including medications.

**Why the Correct Answer is Right**
The drug that causes hirsutism by stimulating androgen production is minoxidil. Minoxidil works by opening potassium channels in the smooth muscle cells of blood vessels, leading to vasodilation and a subsequent increase in blood flow. However, as a side effect, minoxidil also stimulates the growth of hair follicles, leading to excessive hair growth. This is because minoxidil increases the levels of dihydrotestosterone (DHT), a potent androgen that promotes hair growth.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because spironolactone, a potassium-sparing diuretic, is actually used to treat hirsutism by blocking the effects of androgens.

**Option B:**
This option is incorrect because beta-blockers, such as propranolol, are not known to cause hirsutism.

**Option C:**
This option is incorrect because anticoagulants, such as warfarin, do not have a direct effect on androgen production.

**Clinical Pearl / High-Yield Fact**
It's essential to note that minoxidil is not the only medication that can cause hirsutism. Other medications, such as anabolic steroids and testosterone replacement therapy, can also lead to excessive hair growth in women.

**Correct Answer: C. Minoxidil. Minoxidil**