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
Risk of damage to the fetus by maternal rubella is maximum if a mother gets infected in 
Select and explain. 
A. 6 - 12 weeks of pregnancy, B. 20 - 24 weeks of pregnancy, C. 24 - 28 weeks of pregnancy, D. 32 - 36 weeks of pregnancy
A: 6 - 12 weeks of pregnancy
Answer: A: 6 - 12 weeks of pregnancy 
Explanation: 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