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 most common cause of laryngeal stridor in a 60 year old male is - \nSelect and explain. \nA. Nasopharyngeal carcinoma, B. Thyroid carcinoma, C. Foreign body aspiration, D. Carcinoma larynx', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common cause for stridor in 60 years old male will be carcinoma larynx as carcinoma larynx occurs in males (predominantly) at the age of 40–70 years.\nMost common and earliest symptom of subglottic cancer is stridor.\nNOTE:\n\nNasopharyngeal cancer does not lead to stridor\nThyroid cancer causes stridor rarely\nForeign body aspiration is a common cause of stridor in children and not adults.', 'role': 'assistant'}]