This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Risk of damage to the fetus by maternal rubella is maximum if a mother gets infected in \nSelect and explain. \nA. 6 - 12 weeks of pregnancy, B. 20 - 24 weeks of pregnancy, C. 24 - 28 weeks of pregnancy, D. 32 - 36 weeks of pregnancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The first trimester of pregnancy is the most disastrous time - results in abnormalities in the infant in 85% of cases.16% in the second trimester.Bih defects uncommon after 20 weeks of gestation.Park 23e pg: 145', 'role': 'assistant'}]