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: Microbiology
Child acquires antibody against ABO antigen at which age 
Select and explain. 
A. At bih, B. 6 Months, C. 2 Years, D. 5 Years
B: 6 Months
Answer: B: 6 Months 
Explanation: Ans. is 'b' i.e., 6 Months