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
When an antigen is administered for the first time to an animal or a human being who has never been exposed to it, the first antibody to develop- 
Select and explain. 
A. IgG type, B. IgM type, C. IgA type, D. IgE type
B: IgM type
Answer: B: IgM type 
Explanation: Ans. is 'b' i.e., IgM type