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': 'Secretory component is present in: \nSelect and explain. \nA. IgA, B. IgG, C. IgM, D. All of these', 'role': 'user'}, {'content': 'Answer: A \nExplanation: IgA are the secretory antibodies seen in seromucous secretions of gastrointestinal tract, nasopharyngeal tract, urogenital tract, tears, saliva, sweat, etc.,\nReference: Vasudevan 7th\xa0 ed, pg 689', 'role': 'assistant'}]