This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
A rabbit is injected for the first time with ova-albumin. The antibodies generated in this response would be of which class? 
Select and explain. 
A. IgG, B. IgM, C. IgD, D. IgE
B: IgM
Answer: B: IgM 
Explanation: Primary immune response: The response that occurs after a harmful antigen has beenencountered for the first time. In this IgM are produced.Secondary immune response: Is a much quicker and more effective response that occurs after a previously encountered antigen reappears. In this IgG are produced.