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 Orofacial pain is not associated with vascular origin? \nSelect and explain. \nA. Cluster headache, B. Giant cell arteritis, C. Anaesthesia dolorosa, D. Chronic paroxysmal hemicrania', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]