This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 1 (Protozoology), Subject name: Microbiology
[{'content': 'Steatorrhea associated with Giardia infection is seen in which immunoglobulin deficiency ? \nSelect and explain. \nA. IgE, B. IgA, C. IgG, D. IgM', 'role': 'user'}, {'content': 'Answer: B \nExplanation: IgA is the secretory antibody prevent gut infection if IgA level are low predispose to Giardia infection. - IgA1 - present in serum - Ig A2 - present in mucosal surface & body secretions', 'role': 'assistant'}]