This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
Drug of choice for pregnant female suspected of having a baby with congenital adrenal hyperplasia 
Select and explain. 
A. Dexamethasone, B. Betamethasone, C. Hydrocoisone, D. Prednisolone
A: Dexamethasone
Answer: A: Dexamethasone 
Explanation: Refer Goodman Gilman 12/e p 123 To suppress fetal androgen production effectively band consequent virilization Dexamethasone must be initiated before 10 weeks of gestation To treat congenital adrenal hyperplasia is baby hydrocoisone is used.