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: Microbiology
[{'content': 'Half-life of CRP is \nSelect and explain. \nA. 6 hours, B. 12 hours, C. 20 hours, D. 24 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Plasma half-life of CRP is about 19 hours.', 'role': 'assistant'}]