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
Major immunoglobulin secreted by intestine ? 
Select and explain. 
A. IgG, B. IgM, C. IgA, D. IgD
C: IgA
Answer: C: IgA 
Explanation: Ans. is 'c' i.e., IgA