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': 'True about toxoplasmosis is all except - \nSelect and explain. \nA. In adults toxoplasmosis is usually asymptomatic, B. IgG Abs are diagnostic in congenital toxoplasmosis, C. Definitive host is cat, D. Encephalitis is rare in immunocompetent individuals', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CONGENITAL TOXOPLASMOSIS:.Diagnosis: IgM detection in fetal blood, IgA can also be used (experimental but better sensitivity) and Toxoplasma Ag in amniotic fluid, PCR to detect Toxoplasma genes. TOXOPLASMA GONDII: Three morphological forms: Sporulated oocyst, crescentic tachyzoites, tissue cyst containing bradyzoites Infective form: All three morphological forms are infectious Definitive hosts are cat and other felines Intermediate hosts are man and other mammals (goat, sheep) clinical feature:-In adults toxoplasmosis is usually asymptomatic. Encephalitis is rare in immunocompetent individuals and common in immunocompromised patients', 'role': 'assistant'}]