This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Lesions and Stridor, Subject name: ENT
[{'content': 'Sphenoidal sinus opens into: \nSelect and explain. \nA. Superior meatus, B. Inferior meatus, C. Middle meatus, D. Spheno-ethmoidal recess', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (d) Spheno-ethmoidal recess(Ref. Cummings, 6th ed., 659)The Sphenoid sinus opens into the spheno-ethmoidal recess just above the superior turbinate.', 'role': 'assistant'}]