This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Best prenatal treatment CAH is 
Select and explain. 
A. Betamethasone, B. Prednisolone, C. Hydrocortisone, D. Dexamethasone
D: Dexamethasone
Answer: D: Dexamethasone 
Explanation: Prenatal diagnosis of CAH is possible with chorion villus sampling at early weeks of pregnancy using DNA probes

The 17-OHP level in the amniotic fluid is elevated
Prenatal therapy with dexamethasone or termination of pregnancy is the option