This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Precipitation & agglutination are caused by: 
Select and explain. 
A. IgG and IgM, B. IgM and IgG, C. IgM and IgA, D. IgD and IgA
A: IgG and IgM
Answer: A: IgG and IgM 
Explanation: Ans. A. IgG and IgMPrecipitation occurs with IgG when the antigen is soluble while agglutination occurs with IgM when the antigen is particulate/insoluble