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 model of DNA was discovered by Watson and Crick \nSelect and explain. \nA. A- DNA, B. B- DNA, C. C-DNA, D. Z- DNA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common form.Right handed double helix.Highly flexible.Watson and Crick model describes the B- form of DNA.', 'role': 'assistant'}]