This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'Most superior sinus in the face \nSelect and explain. \nA. Frontal, B. Ethmoid, C. Maxillary, D. Sphenoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Frontal sinus: They are situated between the inner and outer tables of frontal bones, above and deep to the supraorbital margin. Maxillary sinus: It occupies the body of the maxilla. Ethmoid sinus: They are thinned walled air cavities int he lateral wall of the ethmoid bones. Spehnoid sinus: it occupies the body of the sphenoid. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 209 and 210)', 'role': 'assistant'}]