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
[{'content': 'Opening of posterior ethmoid sinus is in: \nSelect and explain. \nA. middle turbinate, B. Superior turbinate, C. Inferior turbinate, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]