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': 'Sedimentation coefficient of Ig E is: \nSelect and explain. \nA. 7S, B. 8S, C. 11S, D. 20 S', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans : b 8S Ref: Ananthanarayanan 8th editionSvedberg unit - a sedimentation constant of 1 x 1013sec. Sedimentation unit is studied by ultracentrifugation - for diversity of antibody moleculeIgG -7IgA -7IgM -19Ig D -7IgE -8', 'role': 'assistant'}]