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: ENT
[{'content': 'After mandibulectomy, muscle preventing falling back of tongue - \nSelect and explain. \nA. Genioglossus, B. Hyoglossus, C. Palatopharyngeus, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]