This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basics of DNA, Subject name: Biochemistry
[{'content': 'What is the approximate number of base pairs associated with a single nucleosome? \nSelect and explain. \nA. 146, B. 292, C. 73, D. 1460', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nucleosomes Fundamental unit of DNA organisation. It is Histones complexed to DNA. Two molecules of each of H2A, H2B, H3,and H4 (Core histones) forms a histone octamer. 1 and 3/4 turns (~146 bp) DNA double helix is wound around the histone octamer in a left-handed fashion.', 'role': 'assistant'}]