This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Considerations - Infectious Diseases, Subject name: Pediatrics
[{'content': 'Risk of congenital defects in a baby is maximum, if the gestational age at the time of maternal rubella infection is: \nSelect and explain. \nA. < 11 weeks, B. 11-12 weeks, C. 13-14 weeks, D. 15-16 weeks', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. < 11 weeks(Ref: Nelson's 20/e p 1548-1551)Risk of congenital defects in a baby is maximum, if mother acquires Rubella in the first trimester (before 11 weeks).", 'role': 'assistant'}]