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': 'In giant cell arteritis : \nSelect and explain. \nA. Histological diagnosis is based on fragmentation of the internal intimal, B. C-reactive protein is always raised, C. Giant cell is needed for diagnosis, D. Anaemia is a feature', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]