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: Pharmacology
Oliguria causing drug is? 
Select and explain. 
A. Acyclovir, B. Diazepam, C. Aspirin, D. Montelukast
A: Acyclovir
Answer: A: Acyclovir 
Explanation: Ans. is 'a' i.e., Acyclovir Drugs Causing Oliguria Drugs causing decreased renal perfusion - diuretics. Drugs causing nephrotoxicity - aminoglycosides and chemotherapeutic agents. Urine retention - adrenergic and anticholinergic drugs. Urinary obstruction associated with precipitation of urinary crystals - sulfonamides and acyclovir.