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
Which of the following antimicrobials needs dose reduction even in mild renal failure ? 
Select and explain. 
A. Ciprofloxacin, B. Carbenicillin, C. Cefotaxime, D. Ethambutol
D: Ethambutol
Answer: D: Ethambutol 
Explanation: None