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
[{'content': 'Which of the following drugs is avoided in a patient with high serum creatinine (> 3 mg/dl) ? \nSelect and explain. \nA. Gentamicin, B. Azithromycin, C. Moxifloxacin, D. Amlodipine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]