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': 'Congenital toxoplasmosis not true: \nSelect and explain. \nA. IgA is more sensitive than IgM, B. An increase in IgM beyond 1st week of life is diagnostic, C. IgG is diagnostic, D. Dye test is used', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) IgG is diagnostic', 'role': 'assistant'}]