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': 'Histones are: \nSelect and explain. \nA. Identical to protamine, B. Proteins rich in lysine and arginine, C. Proteins with high molecular weight, D. Insoluble in water and very dilute acids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: These are proteins containing unusually higher concentration of basic amino acids.\nReference: Vasudevan 7th\xa0 ed, pg 576', 'role': 'assistant'}]