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': "Thudichum's nasal speculum is used to visualize - \nSelect and explain. \nA. Tonsils, B. Larynx, C. Anterior nasal cavity, D. Posterior nares", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]