**Core Concept:** Pregnancy-induced hypertension (PIH) is a hypertensive disorder that occurs during pregnancy, characterized by hypertension and proteinuria. The management of PIH aims to protect both the mother and the fetus from complications. The correct drug choice should have favorable effects on blood pressure and proteinuria while minimizing adverse effects on the mother and fetus.

**Why the Correct Answer is Right:**

Correct Answer: **D.** Methyldopa

Methyldopa (Alpha Methyldopa) is a first-line choice for the management of pregnancy-induced hypertension due to its favorable effects:

1. **Effect on blood pressure:** Methyldopa acts as a peripheral alpha-2 adrenergic receptor agonist, leading to vasodilation and a reduction in peripheral vascular resistance. This helps lower blood pressure in patients with PIH.

2. **Low risk to mother and fetus:** Methyldopa does not cross the placenta, reducing its effects on the unborn child. Additionally, it has a low risk of causing maternal hypotension and other complications.

3. **Effect on proteinuria:** Methyldopa improves proteinuria without causing significant renal impairment.

**Why Each Wrong Option is Incorrect:**

A. **Angiotensin-converting enzyme (ACE) inhibitors:** These medications are contraindicated in pregnancy due to their potential to cause fetal renal agenesis and other severe adverse effects.

B. **Calcium channel blockers:** These drugs cross the placenta and can cause fetal hypotension, oligohydramnios, and bradycardia. Additionally, they may increase the risk of preterm labor.

C. **Diuretics:** Although diuretics can be used to lower blood pressure, they can cause maternal hypovolemia, electrolyte imbalances, and may worsen renal function. Moreover, diuretics can exacerbate proteinuria and increase the risk of preterm labor.

D. **Methyldopa:** As explained above, methyldopa is a safe and effective choice for managing pregnancy-induced hypertension due to its favorable effects on blood pressure, proteinuria, and minimal maternal and fetal side effects.

**Clinical Pearl:** It is crucial to consider the potential risks and benefits of each medication option when treating pregnancy-induced hypertension. Methyldopa stands out as a suitable choice due to its minimal risk to both the mother and fetus, while still effectively managing hypertension and proteinuria.