This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Risk period for maximum fetal damage by congenital rubella ? 
Select and explain. 
A. First trimester of pregnancy, B. Second trimester of pregnancy, C. Third trimester of pregnancy, D. Risk is same throughout the pregnancy
A: First trimester of pregnancy
Answer: A: First trimester of pregnancy 
Explanation: Ans. is 'a' i.e., First trimester of pregnancy In general, the earlier in pregnancy infection occurs, the greater the damage to the fetus. Maximum damage to the fetus occurs when infection is acquired in the first trimester of pregnancy.