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
[{'content': 'Drug of choice for pregnant female suspected of having a baby with congenital adrenal hyperplasia \nSelect and explain. \nA. Dexamethasone, B. Betamethasone, C. Hydrocoisone, D. Prednisolone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]