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
A 25 year old primigravida gave bih an infant who has clubfoot. During her pregnancy period she was diagnosed of having oligohydramnios. She didn't get a proper care for this problem. She was under ceain medications during pregnancy. Which of the following must have caused oligohydramnios in this patient? 
Select and explain. 
A. Insulin, B. Enalapril, C. Ciprofloxacin, D. None of the above
B: Enalapril
Answer: B: Enalapril 
Explanation: Exposure to angiotensin-conveing enzyme inhibitors has been associated with oligohydramnios. Conditions Associated with Oligohydramnios: Fetal Chromosomal abnormalities Congenital anomalies Growth restriction Demise Postterm pregnancy Ruptured membranes Placenta Abruption Twin-twin transfusion Maternal Uteroplacental insufficiency Hypeension Preeclampsia Diabetes Drugs Prostaglandin synthase inhibitors Angiotensin-conveing enzyme inhibitors Idiopathic Ref: Cunningham F.G., Leveno K.J., Bloom S.L., Hauth J.C., Rouse D.J., Spong C.Y. (2010). Chapter 21. Disorders of Amnionic Fluid Volume. In F.G. Cunningham, K.J. Leveno, S.L. Bloom, J.C. Hauth, D.J. Rouse, C.Y. Spong (Eds), Williams Obstetrics, 23e.