**Core Concept**
Gynaecomastia is a condition characterized by the enlargement of breast tissue in males, often due to an imbalance of **sex hormones**, specifically an increase in **estrogen** relative to **testosterone**. This imbalance can be caused by various factors, including certain medications. **Pharmacological agents** that alter hormone levels or receptor activity can lead to gynaecomastia.

**Why the Correct Answer is Right**
To determine the correct answer, we must consider the effects of each listed drug on **hormone balance**. However, without specific drug options provided, we'll discuss a general approach: drugs that are known to cause gynaecomastia typically either increase **estrogen** levels, decrease **testosterone** levels, or have **anti-androgenic** effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific drug, we cannot comment on its mechanism.
**Option B:** Similarly, without details, we cannot assess its impact on hormone levels.
**Option C:** And again, the lack of information prevents analysis.
**Option D:** This option's correctness depends on its pharmacological profile regarding sex hormones.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **spironolactone**, a **potassium-sparing diuretic**, is well-known for causing gynaecomastia due to its **anti-androgenic** effects. Recognizing drugs with such side effects is crucial for managing patients on long-term medication.

**Correct Answer:** Unfortunately, without the actual options, a precise answer cannot be provided. Normally, it would be in the format: **Correct Answer: [Letter]. [Answer Text]**