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
Oligohydramnios is associated with 
Select and explain. 
A. Renal agenesis, B. Neural tube defects, C. Postmature birth, D. Premature birth
A: Renal agenesis
Answer: A: Renal agenesis 
Explanation: Etiology of oligohydramnios: 

Intrauterine growth restriction
Post-term pregnancy 
Premature rupture of membrane 
Drugs like ACE inhibitors and prostaglandin inhibitors 
Renal anomalies 
Renal Agenesis 
Infantile polycystic disease 
Upper urinary tract obstructions 
Lower urinary tract obstructions