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
Sphenoid sinusitis pain is referred most commonly to -a) Occiputb) Vertexc) Frontald) Temporal region 
Select and explain. 
A. ab, B. a, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: Acute sphenoditis: ‘Headache – usually localized to the occiput or vertex. Pain may also be referred to the mastoid region.’

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