This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
[{'content': 'All of the following statements about congenital rubella are true except \nSelect and explain. \nA. IgG persists for more than 6 months, B. IgM antibody present at bih, C. Most common anomalies are hearing and hea defects, D. Increased risk of congenital malformation if infection occur after 16 weeks.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The classical triad of symptoms consists of deafness , cataract and congenital hea disease . Delayed manifestations such as diabetes mellitus and renal disease have also been described . Diagnosis is by demonstrating Ig M antibodies in cord or neonatal blood or ig G after 6 months . Reference : GHAI essential paediatrics 9 th edition pg : 264', 'role': 'assistant'}]