This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'The dose of which antibiotic need not be altered in renal failure? \nSelect and explain. \nA. Vancomycin, B. Ethambutol, C. Erythromycin, D. Ciprofloxacin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Antimicrobials needing dose reduction, in renal failure 1. Vancomycin 2. Ethambutol 3. Metronidazole 4. Aminoglycosides 5. Amphotericin B 6. Cephalexin 7. Acyclovir 8. Flucytosine 9. Cotrimoxazole 10. Carbenicillin 11. Cefotaxime 12. Norfloxacin 13. Ciprofloxacin ref - pubmed.com <a href=" <p>', 'role': 'assistant'}]