This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Gynaecology & Obstetrics
Which of the following can be a cause of Oligohydramnios? 
Select and explain. 
A. Multiparity, B. Twins, C. Renal agenesis, D. Macrosomia
C: Renal agenesis
Answer: C: Renal agenesis 
Explanation: Oligohydramnios causes : 1) Fetal chromosomal or structural anomalies 2) Renal agenesis 3) Obstructed uropathy 4) Spontaneous rupture of membranes 5) Intrauterine infections 6) Postmaturity 7) Iugr 8) Amnion nodosum