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: Pathology
[{'content': "'Lock jaw' indicates \nSelect and explain. \nA. Ankylosis, B. Spasm of masseter muscle, C. Inflammatory trismus, D. Fracture of condyle", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]