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
The most common site of sinusitis in children(( REPEAT QUESTION) 
Select and explain. 
A. Inferior meatus, B. Middle meatus, C. Superior meatus, D. Spheno-ethmoidal recess
B: Middle meatus
Answer: B: Middle meatus 
Explanation: Acute ethmoid sinusitis Aetiology Acute ethmoiditis is often associated with infection of other sinuses. Ethmoid sinuses are more often involved in infants and young children.It opens into middle meatus. (Ref: Diseases of ENT, PL Dhingra, 7th edition, of no. 216)