This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Sinus least involved in children is: 
Select and explain. 
A. Ethmoid, B. Maxillary, C. Frontal, D. Sphenoid
D: Sphenoid
Answer: D: Sphenoid 
Explanation: The reason for sphenoid sinus to be least affected as it opens high up in the sphenoid recess which is not affected by most of the conditions of nose. Ref Dhingra 6/e,p 193