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': 'The nasopharyngeal space is visualized in OPD by - \nSelect and explain. \nA. PNS mirror, B. Tongue depressor, C. Both PNS mirror & tongue depressor, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]