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': 'Sphenoid sinusitis pain is referred most commonly to: \nSelect and explain. \nA. Occiput, B. Cost of nose, C. Frontal, D. Temporal region', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acute sphenoiditis: Headache usually localized to the occiput or veex. Pain may also be referred to the mastoid region. Ref Dhingra 6/e,p 194.', 'role': 'assistant'}]