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: Anatomy
[{'content': 'The anterior relation of the middle ear cavity is: \nSelect and explain. \nA. Chorda tympani, B. Tegmen tympani, C. Tensor tympani, D. Facial nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]