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': 'All of the following are false regarding classes if immunoglobulin except : \nSelect and explain. \nA. IgM has maximum half-life of 23 days, B. IgE has least serum concentration of 0.00004 mg/ml, C. IgG has maximum sedimentation co-efficient of 19, D. IgD has a carbohydrate concentration of 8 %', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Highest serum half-life and serum concentration is of IgG. Least serum half-life and serum concentration is of IgE. Highest sedimentation coefficient is of IgM IgG IgM IgA IgD IgE Serum concentration 12 mg/ml 1.2 mg/ml 2 mg/ml 0.03 mg/ml 0.00004 mg/ml Half-life 23 d 5 d 6 d 2-8 d 1-5 d Molecular wt. 150,000 900,000 160,000 180,000 190,000 Carbohydrate 2-3% 12% 8% 13% 12% Sedimentation coeff 7 19 7 7 8', 'role': 'assistant'}]