This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Prenatal Diagnosis, Subject name: Gynaecology & Obstetrics
Amniocentesis is done for all of the mentioned indications EXCEPT 
Select and explain. 
A. Fetal Lung maturity, B. Oligohydramnios, C. Congenital infections, D. Genetic defects
B: Oligohydramnios
Answer: B: Oligohydramnios 
Explanation: Indications of Amniocenetesis- Fetal genetic disorders Congenital infections Allo immunizations Fetal lung maturity Amnioinfusion is done for oligohydramnios. Amniocenetesis may be done for polyhydramnios as a therapeutic measure.