This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology Pa 1 (Immune Response, Antigen-Antibody Reactions, Hypersensitivity, Structure of Immune System, Immunodeficiency Disorders), Subject name: Microbiology
[{'content': 'Pentavalent immunoglobin is- \nSelect and explain. \nA. IgA, B. IgG, C. IgM, D. IgE', 'role': 'user'}, {'content': 'Answer: C \nExplanation: IgM IgM is Pentavalent Ig It has max molecular weight It has max sedimentation coefficient IgM is produced first in immune response IgM plays a role in :- 1. Opsonisation 2. Classical complement pathway 3. IgM & IgD are present over B cell surface', 'role': 'assistant'}]