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': 'Pain sensation from ethmoid sinus is carried by \nSelect and explain. \nA. Ethmoid nerve, B. Nasociliary nerve, C. Maxillary nerve, D. Greater petrosal nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]