This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Disorders, Subject name: Pediatrics
Anti-A, anti-B, antibody appear in child - 
Select and explain. 
A. Just after birth, B. 1 week after, C. 6 week after, D. After 6 months
D: After 6 months
Answer: D: After 6 months 
Explanation: Ans. is 'd' i.e.. After 6 months o litre of anti-A and anti-B antibodies is almost zero immedietly after birth.o Infants start producing anti-A and anti-B antibodies at age of 2-8 month when corresponding antigen is not present in cell.o Maximum titre rech at 8 to 10 years of age after that it started declinning.