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': 'Proteins seen in chromosomes are called \nSelect and explain. \nA. Nucleotides, B. Histones, C. Apoproteins, D. Glycoproteins', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Histones are the most abundant histone proteins.', 'role': 'assistant'}]