This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Oligohydramnios is associated with : 
Select and explain. 
A. Neural tube defects, B. Renal agenesis, C. Postmature bih, D. Premature bih
B: Renal agenesis
Answer: B: Renal agenesis 
Explanation: Etiology of oligohydramnios: Intrauterine growth restriction Post-term pregnancy Premature rupture of membranes Drugs like ACE inhibitors and prostaglandin inhibitors Renal anomalies Renal Agenesis Infantile polycystic kidney disease urinary tract obstruction (refer pgno:216 Sheila 2nd edition)