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': 'Red man syndrome occurs with : \nSelect and explain. \nA. Clindamycin, B. Teicoplanin, C. Vancomycin, D. Polymyxin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]