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': 'In indirect larynogscopy not seen is - \nSelect and explain. \nA. Base of tongue, B. Pyriform fossa, C. Glottis, D. Sub glottis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]