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
Opening of posterior ethmoid sinus is in: 
Select and explain. 
A. middle turbinate, B. Superior turbinate, C. Inferior turbinate, D. None
B: Superior turbinate
Answer: B: Superior turbinate 
Explanation: 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.