The following are contraindicated in pregnancy except (AIIME Nov 2010)
a. Sodium nitroprusside is not given during pregnancy due to toxicity.
b. blockers during pregnancy decreases birth weight, placental size, hypoglycemia. Look for neonatal bradycardia and hypotension.
Efficacy of Labetalol for short term management appears equal to methyl dopa.
c. Diuretics decreases blood volume and causes Utero placental perfusion deficit. So there is increased is increased fetal loss, placental infarcts, miscarriage, still birth.
ACE Inhibitiors compromise fetal renal system leading to oilguria even fatal anuria resulting in oligohydramnios which may cause growth retardation, Craniofacial malformations etc.
So, Labetalol is the best answer here.