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
Drug not requiring dose adjustment in renal disease is 
Select and explain. 
A. Aminoglycoside, B. Vancomycin, C. Calcium channel blocker, D. Metronidazole
C: Calcium channel blocker
Answer: C: Calcium channel blocker 
Explanation: None