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': 'Half life of IgG is \nSelect and explain. \nA. 1-5 days, B. 2-8 days, C. 6 days, D. 20-23 days', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Half-life of different immunoglobulins –\nIgG - About 22 to 25 days\nIgA - About 6 to 8 days\nIgM - About 5 days\nIgE - About 2 to 8 days\nIgD - About 3 days', 'role': 'assistant'}]