This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Watson and Crick are associated with - \nSelect and explain. \nA. Discovery of helical structure of DNA, B. Association of Helicobacter pylon with chronic gastritis, C. Discovery of HIV virus, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: They proposed the double hellical model of DNA', 'role': 'assistant'}]