This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Bilateral hydroureteronephrosis is usually the result of 
Select and explain. 
A. Posterior urethral valves, B. Urethral stricture, C. Benign prostatic hyperplasia, D. Bilateral renal calculi
D: Bilateral renal calculi
Answer: D: Bilateral renal calculi 
Explanation: Only bilateral ureteric calculi cause hydroureteronephrosis