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: Pathology
[{'content': 'Which of the following causes of orofacial pain is not associated with vascular origin: \nSelect and explain. \nA. Cluster headache, B. Giant cell Arteritis, C. Anesthesia dolorosa, D. Chronic paroxysmal hemicraria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]