Most common sinus involved in acute sinusitis?: (A) Ethmoid, (B) Maxillary, (C) Sphenoid, (D) Frontal
Answer is B. The sinus most commonly involved is the maxillary followed in turn by ethmoid, frontal and sphenoid. (Ref: Diseases of ENT, PL Dhingra, 7th edition, of no. 213)