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': 'Most common complication of condylar injuries in\nchildren \nSelect and explain. \nA. Pain, B. Ankylosis, C. Osteoarthritis, D. Fracture of glenoid fossa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]