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 part of Infants respiratory tract 
Select and explain. 
A. Glottis, B. Subglottis, C. Carina, D. None of the above
B: Subglottis
Answer: B: Subglottis 
Explanation: Q neonates narrowest part of larynk : Subglottis.
Q adutls narrowest part of larynk : Glottis.