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
All of the following are causes of primary headache EXCEPT: 
Select and explain. 
A. Migraine, B. Tension headache, C. Cluster headache, D. Sinusitis
D: Sinusitis
Answer: D: Sinusitis 
Explanation: 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