This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 1 (Protozoology), Subject name: Microbiology
[{'content': 'Toxoplasmosis in the fetus can be best confirmed by - \nSelect and explain. \nA. IgM Abs against toxoplasmosis in the mother, B. IgM Abs against toxoplasmosis in the fetus, C. IgG Abs against toxoplasmosis in the mother, D. IgG Abs against toxoplasmosis in the fetus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diagnosis of Congenital toxoplasmosis: Presence of IgM Abs in fetus indicates congenital infection. The presence of circulating IgA ors the diagnosis of an acute infection as IgA-ELISA is more sensitive than IgM-ELISA for detecting congenital infection in the fetus. Toxoplasma Ag in amniotic fluid, PCR to detect Toxoplasma genes.', 'role': 'assistant'}]