This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexuality and intersexuality, Subject name: Gynaecology & Obstetrics
Best prenatal treatment CAH is : 
Select and explain. 
A. Dexamethasone, B. Betamethasone, C. Prednisolone, D. Hydrocoisone
A: Dexamethasone
Answer: A: Dexamethasone 
Explanation: Prenatal diagnosis of CAH is possible with chorion villus sampling at early weeks of pregnancy using DNA probes. 17-OHP level in the amniotic fluid is elevated Prenatal therapy with dexamethasone or termination of pregnancy is the option Ref: D.C.DUTTA'S TEXTBOOK OF GYNAECOLOGY,6th edition; Pg no:445