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: Surgery
[{'content': 'Which of the following is most common symptom of tetanus \nSelect and explain. \nA. Risus sardonicus, B. Trismus, C. Hyperreflexia, D. Tonic clonic convulsion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Trismus, due to spasm of masseter and pterygoids is the most common symptom of tetanus.', 'role': 'assistant'}]