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
[{'content': 'Immunoglobulin present in mouth local secretions? \nSelect and explain. \nA. IgA, B. IgM, C. IgG, D. IgE', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.,IgA It is the second most abundant antibody (after IgG). It is major immunoglobulin in clostrum, saliva, tears, respiratory and gastrointestinal secretions.", 'role': 'assistant'}]