This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'TRUE about immunoglobulins is - \nSelect and explain. \nA. IgE fixes complement, B. IgM fixes complement, C. IgG is found in minimum concentration, D. IgG is elevated in primary immune response', 'role': 'user'}, {'content': "Answer: B \nExplanation: IgM is paicularly effective at complement activation by binding to C1 Ref: Ananthanarayan & Parker's textbook of microbiology 9th edition pf:98", 'role': 'assistant'}]