This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: ENT
[{'content': 'Inspiratory stridor is obstructive lesions of: \nSelect and explain. \nA. Trachea, B. Bronchus, C. Subglottis, D. Supraglottis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: STRIDOR 1. Inspiratory stridor - obstructive lesion of supraglottis of pharynx. 2. Expiratory stridor - lesion of thoracic trachea, primary and secondary bronchi 3. Biphasic stridor - lesion of glottis sub glottis and cervical trachea', 'role': 'assistant'}]