This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose, Subject name: Anatomy
[{'content': 'The following open in the middle meatus of nose EXCEPT: \nSelect and explain. \nA. Maxillary sinus, B. Anterior ethmoidal sinus, C. Middle ethmoidal sinus, D. Posterior ethmoidal sinus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. d (Posterior ethmoidal sinus). (Ref. BD Chaurasia, Human Anatomy- Vol. II, 3rd ed., 197)MeatusStructures opening in itFeatures of middle meatus of noseEthmoidal bullaHiatus semilunarisInfundibulumOpening of frontal air sinusOpening of maxillary air sinusOpening of middle ethmoidal air sinusSuperior meatusOpening of posterior ethmoidal air sinusInferior meatusOpening of naso-lacrimal duct guarded by Hasner's valve.", 'role': 'assistant'}]