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
Inspiratory stridor is obstructive lesions of: 
Select and explain. 
A. Trachea, B. Bronchus, C. Subglottis, D. Supraglottis
D: Supraglottis
Answer: D: Supraglottis 
Explanation: 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