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': 'Which immunogloblin is least impoant in human being - \nSelect and explain. \nA. IgE, B. IgD, C. IgG, D. IgA', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., lgD", 'role': 'assistant'}]