This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'Antrum of Highmore is ? \nSelect and explain. \nA. Maxillary, B. Ethmoid, C. Sphenoid, D. Frontal', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is'a'i.e., MaxillaryMaxillary sinus is also called Antrum of Highmore.", 'role': 'assistant'}]