Opening of posterior ethmoid sinus is in:: (A) middle turbinate, (B) Superior turbinate, (C) Inferior turbinate, (D) None
Answer is B. Posterior group of paranasal sinus which include posterior ethmoidal sinuses open in the superior meatus and the sphe-noid sinus which opens in sphenoethmoidal recess Ref: Dhingra 7e pg 209.