This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Hbs has defect in aminoacid position - \nSelect and explain. \nA. 4, B. 6, C. 11, D. 12', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 6', 'role': 'assistant'}]