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
Which of the following is not core histone protein 
Select and explain. 
A. H1, B. H2A, C. H2B, D. H3
A: H1
Answer: A: H1 
Explanation: H1 is linker protein.
Core histoner are H2A, H2B, H3, H4.