**Core Concept**
Eclampsia is a severe complication of preeclampsia, characterized by seizures in pregnant women. The management of eclampsia involves controlling seizures, stabilizing blood pressure, and ensuring maternal and fetal well-being.

**Why the Correct Answer is Right**
Magnesium sulfate (MgSO4) is the preferred treatment for eclampsia due to its ability to prevent seizures and control blood pressure. It works by inhibiting neuronal calcium ion influx, thus stabilizing neuronal membranes and preventing seizures. MgSO4 also has a direct effect on blood vessels, causing vasodilation and reducing blood pressure. The mechanism of action of MgSO4 is not significantly affected by the presence of the fetus, making it a safe choice for treating eclampsia.

**Why Each Wrong Option is Incorrect**
**Option A:** Corticosteroids are used to enhance fetal lung maturity, but they do not directly treat eclampsia. They may have a mild effect on the fetus, but they are not the primary treatment for eclampsia.

**Option B:** Labetalol is a beta-blocker used to control blood pressure, but it may have a significant effect on the fetus, especially in terms of fetal heart rate and blood pressure. It is not the preferred treatment for eclampsia.

**Option C:** Induction of labor is a treatment for preeclampsia, but it may not be the best option for eclampsia. Induction of labor can lead to increased fetal distress and complications.

**Option D:** Diazepam is a benzodiazepine that can be used to control seizures, but it may have a significant effect on the fetus, especially in terms of sedation and respiratory depression. It is not the preferred treatment for eclampsia.

**Clinical Pearl / High-Yield Fact**
Magnesium sulfate is the preferred treatment for eclampsia due to its ability to prevent seizures and control blood pressure without significant effects on the fetus.

**Correct Answer:** A. Corticosteroids are used to enhance fetal lung maturity, but they do not directly treat eclampsia.