This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
[{'content': 'True about sphenoid sinus: (PGI May 2010) \nSelect and explain. \nA. Lined by stratified squamous epithelium, B. Duct open in middle meatus, C. Open in sphenoethmoid recess, D. Present at birth', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: C (Open in sphenoethmoid recess) The paranasal air sinuses are lined with respiratory epithelium {ciliated pseudostratified columnar epithelium)"- www.american- rbinologic. orgypatientLnfo.sinusnasalanatomyphtrnlAnatomy of PNS EL Dhingra 5th/201Anterior group: This includes maxillary, frontal and anterior ethmoidal. They all open in the middle meatus/ and their ostia lie anterior to basal lamella of middle turbinate.Posterior groups: This includes posterior ethmoidal sinuses which open in the superior meatus, and the sphenoid sinus which open in sphenoethmoidal recess/.Table These occupy the body ofthe sphenoid boneTrue growth of the sin us occu rs at pubertyZ:', 'role': 'assistant'}]