This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
[{'content': "Patient present with severe headache with the following sign. Diagnosis? \nSelect and explain. \nA. Giant cell arteritis, B. Wegner's granulomatosus, C. Microscopic polyangiitis, D. Takayasu arteritis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Giant Cell ArteritisImage Shows Enlarged Temporal Artery* Age >50yrs* New onset localized headache* Temporal: abnormalities- Decreased pulse- Tenderness and Nodules and thickening* Increased ESR >50* Positive temporal: biopsy (panarteritis, proliferation of the intima and fragmentation of internal elastic lamina)', 'role': 'assistant'}]