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': 'Which of the following is not core histone protein \nSelect and explain. \nA. H1, B. H2A, C. H2B, D. H3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: H1 is linker protein.\nCore histoner are H2A, H2B, H3, H4.', 'role': 'assistant'}]