This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Headache, Subject name: Medicine
[{'content': 'All of the following are causes of primary headache EXCEPT: \nSelect and explain. \nA. Migraine, B. Tension headache, C. Cluster headache, D. Sinusitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) SinusitisRef: Harrison 18th edition,chapter 14Primary HeadacheSecondary HeadacheType %Type %Tension -Type 69Systemic infection 63Migraine 16Head injury 4Idiopathic stabbing 2Vascular disorders 1Extertional 1Subarachnoid hemorrhage <1Cluster 0.1Brain tumor 0.1', 'role': 'assistant'}]