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: Surgery
[{'content': 'Caldwell Luc procedure is carried out to access? \nSelect and explain. \nA. Orbital cavity, B. Maxillary sinus, C. Nasal floor, D. Submandibular space', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]