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 complements, B. IgM fixes complements., C. IgG is found in minimum concentration., D. IgG is elevated in primary immune response.', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. IgM Fixes complement. Important facts about Immuno globinsImmunoglobulin to fix complements via classical pathway - IgG & IgM (IgM- IgG)*Immunoglobulin to fix complements via Alternate pathway - IgA & IgD*Immunoglobulin with ,maximum serum cone -IgG*Immunoglobulin with minimum serum cone -IgE*Heat Labile Immunoglobulin -IgE*Immunoglobulin in primary immune response -IgM*Immunoglobulin in 2ndary immune response -IgG*Immunoglobulin with maximum molecular weight -IgM*Immunoglobulin present in milk - IgA & IgG*Immunoglobulin with maximum sedimentation coefficient -IgM*Immunoglobulin with shortest 1/2 life -IgE*Immunoglobulin in sero mucinous Glands -IgG & IgA*Ig resp. for hypersensitive pneumonitis -Ig G*Ig mediating the Prausnitz Kustner reaction -Ig E*Homo cytotropism is seen in which Ig -Ig E*", 'role': 'assistant'}]