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': 'Trismus during block anesthesia is as a result of \nSelect and explain. \nA. Massive edema, B. Damage to medial pterygoid, C. Damage to lateral pterygoid, D. Damage to inferior alveolar nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]