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 is caused by \nSelect and explain. \nA. Vancomycin, B. Teicoplanin, C. Both 1 & 2, D. Ciprofloxacin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vacomycin can release histamine & lead to "Red man syndrome".', 'role': 'assistant'}]