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: Dental
[{'content': 'Maxillary antrum dips in the region of? \nSelect and explain. \nA. Between 2nd premolar and 1 molar, B. Between buccal roots of furcation of 1st molar, C. Between 1 & 2 premolar, D. Between 1 & 2 molars', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]