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: Social & Preventive Medicine
[{'content': 'Toxic shock syndrome is due to which vaccine \nSelect and explain. \nA. Measles, B. Mumps, C. Salk, D. Tetanus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]