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': 'Activation of classical complement pathway - \nSelect and explain. \nA. IgA, B. IgG, C. IgM, D. IgD', 'role': 'user'}, {'content': "Answer: C \nExplanation: IgM is paicularly effective at complement activation Ref: Ananthanarayan & Parker's textbook of microbiology 9th edition pf:98", 'role': 'assistant'}]