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: Pathology
[{'content': 'Watson and Crick are associated with ? \nSelect and explain. \nA. Discovery of helical structure of DNA, B. Association of Helicobacter pylori with chronic gastritis, C. Discovery of HIV virus, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Discovery of helical structure of DNA", 'role': 'assistant'}]