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: Microbiology
[{'content': 'Most common symptom of tetanus is: \nSelect and explain. \nA. Tonic-clonic seizures, B. Hemplegia, C. Lock-jaw, D. Opisthotonus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is. 'c' i. e. Lock-jaw", 'role': 'assistant'}]