This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Ethmoidal sinus opens into which of the following \nSelect and explain. \nA. Hiatus semilunaris, B. Middle meatus, C. Superior meatus, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The anterior ethmoidal air sinus is opened into the anterior pa of the hiatus semilunaris The middle ethmoidal air sinus is opened into the middle meatus of the nose The posterior ethmoidal air sinus is opened into the superior meatus of the nose <img src=" /> Ref BDC volume 3,6th edition pg 246', 'role': 'assistant'}]