A pregnant mother presents with history of delivery of a previous child with Congenital Adrenal Hyperplasia (CAH).The best management protocol for the current pregnancy is;

• A. To start dexamethasone as soon as pregnancy is confirmed
• B. To start prednisolone after establishing whether fetus is affected by Chorionic Villous Sampling
• C. To start prednisolone after determining sex of the fetus with USG
• D. To start dexamethasone after determining sex of the fetus by Karyotyping