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: Medicine
[{'content': "Jaw tightness in proximal temporal arteries.diagnosis - \nSelect and explain. \nA. PAN, B. Coarctation of aorta, C. Giant cell arteritis, D. Wegner's granulomatosis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]