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
More than 90% of this drug is excreted in the urine in intact form. Because its urinary solubility is low, patients should be well hydrated to prevent nephrotoxicity. The drug is : 
Select and explain. 
A. Indinavir, B. Zidovudine, C. Acyclovir, D. Amantadine
C: Acyclovir
Answer: C: Acyclovir 
Explanation: None