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
Pentavalent immunoglobulin is- 
Select and explain. 
A. IgA, B. IgG, C. IgM, D. IgE
C: IgM
Answer: C: IgM 
Explanation: None