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': "Bernoulli's theorem explains - \nSelect and explain. \nA. Nasal polyp, B. Thyroglossal cyst, C. Zenker's diverticulum, D. Laryngomalacia", 'role': 'user'}, {'content': "Answer: A \nExplanation: The increased speed of the air flowing through the nose decreases the pressure in the nasal cavity (Bernoulli's theorem) which pulls down the polyp.", 'role': 'assistant'}]