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: Medicine
[{'content': 'Red man syndrome is caused by: \nSelect and explain. \nA. Telithromycin, B. Telavancin, C. Vancomycin, D. Rifampin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It causes anaphylactoid reaction - red man syndrome Ref: Harrison, Edition-18, Page : 1146.', 'role': 'assistant'}]