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: Pharmacology
Which of the following regimen of antenatal steroids is preferred for Fetal lung maturation? 
Select and explain. 
A. Dexamethasone 6mg 12 hourly 4 doses, B. Betamethasone 6mg 12 hourly 4 doses, C. Betamethasone 12 mg 12 hourly 4 doses, D. Dexamethasone 12mg 12 hourly 4 doses
A: Dexamethasone 6mg 12 hourly 4 doses
Answer: A: Dexamethasone 6mg 12 hourly 4 doses 
Explanation: Antenatal steroids are given to prevent respiratory distress syndrome in case of preterm labour.
Recommended regimens are :
Dexamethasone 6mg 12 hourly 4 doses
Betamethasone 12mg 24 hourly 2 doses