This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adrenal, Subject name: Pharmacology
[{'content': 'Drug of choice for pregnant female suspected of having a baby with congenital adrenal hyperplasia is: \nSelect and explain. \nA. Dexamethasone, B. Aldosterone, C. Hydrocoisone, D. Predinsolone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: To suppress fetal androgen production effectively and consequent virilization, Dexamethasone must be initiated before 10 weeks of gestation. Note: To treat congenital adrenal hyperplasia in baby--> Hydrocoisone is used.', 'role': 'assistant'}]