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': 'true about TRIAD congenital rubella syndrome \nSelect and explain. \nA. PDA, cataract and deafness is seen, B. Hepatosplenomegaly, mental retardation, deafness, C. Chorioretinitis, multiorgan failure, pneumonitis, D. None of these', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer: A. PDA, cataract and deafness is seenCongenital rubella syndrome (CRS) can occur in a developing fetus of a pregnant woman who has contracted rubella, usually in the first trimester. If infection occurs 0-28 days before conception, the infant has a 43% risk of being affected.Infection in 2nd trimester - may be deafness only.>6 wks - no major abnormalitiesDiagnosis: Isolation of virus in cell cultures of throat samples, urine or other secretions.Detection of IgM in single serum sample sholy after bih.Persistance of Rubella IgG antibodies serum beyond 1 year or rising antibody titer anytime during infancy in an unvaccinated child', 'role': 'assistant'}]