## **Core Concept**
Variant angina, also known as Prinzmetal's angina, is a condition caused by transient coronary artery spasm leading to temporary reduction in blood flow to the heart muscle. The management of variant angina focuses on relieving the spasm and preventing future episodes. **Calcium channel blockers** are a mainstay of treatment.

## **Why the Correct Answer is Right**
The correct answer, **A. Nifedipine**, is a calcium channel blocker. However, not all calcium channel blockers are suitable for variant angina. **Non-selective** or **unselective** beta-blockers can actually worsen or precipitate variant angina by leaving alpha-mediated coronary artery vasoconstriction unopposed, as beta-2 receptors cause vasodilation.

## **Why Each Wrong Option is Incorrect**
- **Option B:** Verapamil is a calcium channel blocker, specifically a non-dihydropyridine type, which is often used to treat variant angina. It helps in relieving the spasm and is not contraindicated.
- **Option C:** Diltiazem is another calcium channel blocker used in the management of variant angina for similar reasons as verapamil.
- **Option D:** Propranolol is a non-selective beta-blocker. **Non-selective beta-blockers like propranolol are contraindicated in variant angina** because they can cause unopposed alpha-adrenergic receptor-mediated coronary vasoconstriction, potentially worsening the spasm.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **beta-blockers, especially non-selective ones, are generally contraindicated in variant (Prinzmetal's) angina** due to their potential to worsen coronary spasm. Always consider the type of angina when choosing treatment; for typical angina, beta-blockers are often used, but for variant angina, calcium channel blockers are preferred.

## **Correct Answer:** . Propranolol