## **Core Concept**
The question tests knowledge of anti-hypertensive drugs and their safety profiles during pregnancy. Pregnancy-induced hypertension is a significant concern, and the choice of anti-hypertensive medication is crucial to ensure the safety of both the mother and the fetus. Certain anti-hypertensive drugs are contraindicated in pregnancy due to their potential to cause fetal harm.

## **Why the Correct Answer is Right**
The correct answer, . **ACE inhibitors** (Angiotensin-Converting Enzyme inhibitors) are contraindicated in pregnancy, particularly in the second and third trimesters, due to the risk of fetal harm. They can cause fetal hypotension, renal failure, and skull hypoplasia. ACE inhibitors work by inhibiting the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor. In pregnancy, this can lead to decreased placental perfusion and subsequent fetal complications.

## **Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, but typically, drugs like **Methyldopa** are considered safe in pregnancy.
* **Option B:** This option is not provided, but drugs such as **Nifedipine** (a calcium channel blocker) can be used in pregnancy under certain conditions.
* **Option D:** This option is not provided, but **Propranolol**, a beta-blocker, can be used in pregnancy but with caution, especially in the first trimester.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **ACE inhibitors** and **Angiotensin Receptor Blockers (ARBs)** are contraindicated in pregnancy due to their association with fetal risks. For pregnant women with hypertension, safer alternatives like **Methyldopa**, **Labetalol**, or **Nifedipine** are often recommended.

## **Correct Answer: C. ACE inhibitors**.