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
Subglottic stenosis in term infants is a subglottic diameter of less than: 
Select and explain. 
A. 2 mm, B. 3 mm, C. 4 mm, D. 5 mm
C: 4 mm
Answer: C: 4 mm 
Explanation: A subglottic diameter of less than or equal to 4 mm in a full-term neonate is considered to be abnormal.