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: Pediatrics
Drug used in the treatment of CAH in a child is: 
Select and explain. 
A. Dexamethasone, B. Betamethasone, C. Prednisolone, D. Hydrocortisone
D: Hydrocortisone
Answer: D: Hydrocortisone 
Explanation: d. Hydrocortisone(Ref: Nelson's 20/e p 2719)Treatment of CAH (21 hydroxylase deficiency) involves use of Hydrocortisone 15-20mg/m2/24hr, administered orally in 3 divided doses. Double or triple doses are indicated during periods of stress, such as infection or surgery.