**Core Concept:** Pre-eclampsia is a severe complication of pregnancy characterized by hypertension and proteinuria after 20 weeks gestation. Seizures are a severe complication of pre-eclampsia and require immediate medical intervention.

**Why the Correct Answer is Right:** In the case of a pregnant woman with pre-eclampsia developing seizures, the first priority is to control the seizure activity and manage the underlying pre-eclampsia. The correct answer, option D, involves administering magnesium sulfate as the first-line therapy for seizure control due to its high efficacy, minimal side effects, and proven neuroprotective properties.

**Why Each Wrong Option is Incorrect:**

A. **Magnesium sulfate is not the first-line therapy for seizure control:** This is incorrect because magnesium sulfate is the recommended treatment for seizures in pregnant patients with pre-eclampsia, due to its neuroprotective properties and minimal side effects.

B. **Diuretics are contraindicated:** Diuretics are not a recommended treatment option in pre-eclampsia, as they can exacerbate hypertension and potentially lead to worsening of kidney function.

C. **Anticonvulsants:** Anticonvulsants are not the first-line therapy for seizure control in pre-eclampsia due to their potential side effects, such as sedation and respiratory depression, making them less suitable for pregnant patients.

D. **Magnesium sulfate is the first-line therapy for seizure control in pre-eclampsia:** As mentioned earlier, magnesium sulfate is the recommended treatment for seizure control in pregnant patients with pre-eclampsia due to its neuroprotective properties and minimal side effects.

**Clinical Pearl:** In cases of severe pre-eclampsia-induced seizures, the use of magnesium sulfate provides effective seizure control and minimizes potential complications for both the mother and the fetus.