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: Surgery
Acute onset of anuria in elderly men 
Select and explain. 
A. Bilateral infarction of kidneys, B. Obstructive urinary disease, C. Acute tubular necrosis, D. Acute cortical necrosis
B: Obstructive urinary disease
Answer: B: Obstructive urinary disease 
Explanation: None