This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Histone in nucleosome core are all except \nSelect and explain. \nA. H2A, B. H2B, C. H3, D. H1', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In addition to binding to the nucleosome, the H1 protein binds to the "linker DNA" (approximately 20-80 nucleotides in length) region between nucleosomes, helping stabilize the zig-zagged 30 nm chromatin fiber Ref-Harpers illustrated biochemistry 30/e p280', 'role': 'assistant'}]