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
Which among the following sinus is affected in children most commonly: 
Select and explain. 
A. Sphenoid, B. Ethmoid, C. Frontal, D. Maxillary
B: Ethmoid
Answer: B: Ethmoid 
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. (Ref: Diseases of ENT, PL Dhingra, 7th edition, of no. 216)