**Core Concept**
Antiplatelet drugs are a class of medications that inhibit platelet aggregation and prevent blood clots. They are used to reduce the risk of cardiovascular events such as heart attacks and strokes. The primary mechanism of action of antiplatelet drugs involves the inhibition of platelet activation and aggregation, which is mediated by various enzymes and receptors.

**Why the Correct Answer is Right**
Antiplatelet drugs work by targeting key enzymes and receptors involved in platelet activation and aggregation. Examples of antiplatelet drugs include aspirin, which inhibits cyclooxygenase (COX) enzymes, preventing the production of thromboxane A2, a potent platelet activator. Other antiplatelet drugs, such as clopidogrel, work by inhibiting the P2Y12 receptor, which is involved in platelet aggregation.

**Why Each Wrong Option is Incorrect**
**Option A:** Aspirin is an antiplatelet drug that inhibits COX enzymes, preventing platelet activation.
**Option B:** Clopidogrel is an antiplatelet drug that inhibits the P2Y12 receptor, preventing platelet aggregation.
**Option C:** Prasugrel is also an antiplatelet drug that inhibits the P2Y12 receptor, similar to clopidogrel.

**Clinical Pearl / High-Yield Fact**
It's essential to note that antiplatelet drugs can increase the risk of bleeding, particularly in patients with a history of gastrointestinal bleeding or those taking anticoagulant medications. Regular monitoring of platelet function and bleeding risk is crucial in patients on antiplatelet therapy.

**Correct Answer: D.**