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
In acute sinusitis,the sinus more involved in children is: 
Select and explain. 
A. maxillary, B. Sphenoid, C. Ethmoid, D. Frontal
C: Ethmoid
Answer: C: Ethmoid 
Explanation: Most common sinus effected in children-ethmoid most common sinus effected in adult-Maxillary Ref.Dhingra 6/e,p 193