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': 'Capacity, of producing IgG stas at what age - \nSelect and explain. \nA. 6 months, B. 1 year, C. 2 years, D. 3 years', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 6 months", 'role': 'assistant'}]