This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: VBDs, Arboviral & Viral Infections, Surface Infections, Subject name: Social & Preventive Medicine
[{'content': 'Risk of damage to fetus by maternal rubella is maximum if 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 risk of congenital malformations following infections by teratogenic organisms is maximum in first trimester, so the best option is 6-12 weeks.', 'role': 'assistant'}]