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
Narrowest pa of respiratory tract in adult is: 
Select and explain. 
A. Trachea, B. Glottis, C. Supraglottis, D. Subglottis
B: Glottis
Answer: B: Glottis 
Explanation: The narrowest pa of larynx In adults - Glottis In children - Subglottis