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': 'An oral diaphragm is formed by - \nSelect and explain. \nA. Mylohyoid, B. Genioglossus, C. Hyoglossus, D. Buccinator', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]