Thickening of eyelashes is side effect of which:
**Core Concept**
The question is testing knowledge of a specific side effect associated with a medication, specifically **prostaglandin analogs** used in the treatment of glaucoma. This side effect is related to the **pharmacological effects** of these drugs on hair growth.
**Why the Correct Answer is Right**
The correct answer is related to **bimatoprost**, a **prostaglandin analog**. This class of drugs is known to cause **hypertrichosis**, particularly **thickening of eyelashes**, as a side effect due to its mechanism of action on **hair follicles**.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not specifically associated with this side effect.
**Option B:** Incorrect as it does not have this particular side effect.
**Option C:** Incorrect because, although it has various side effects, thickening of eyelashes is not commonly associated with it.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **prostaglandin analogs**, such as **bimatoprost**, can cause **hypertrichosis**. This side effect is notable in the treatment of **glaucoma** and has led to the development of drugs like **bimatoprost** for **cosmetic use** in enhancing eyelash growth.
**Correct Answer:** D. Bimatoprost.