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': 'Most superior sinus in the face is: \nSelect and explain. \nA. Frontal sinus, B. Ethmoid sinus, C. Maxillary sinus, D. Sphenoid sinus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Frontal sinus(Ref. Scott Brown, 6th ed., 4/3/2)Most superior sinus is the frontal sinus followed by ethmoid, sphenoid and maxillary sinuses.', 'role': 'assistant'}]