This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, 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: In the first six months of life, the fetus has the same antibodies as the mother, till the old antibodies are then degraded and he can defend himself against all the pathogens that the mother encoutered in her life', 'role': 'assistant'}]