This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Watson and crick are known for: \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: Watson and Crick discovered helical structure of DNA and won a noble prize for it (Ref: TEXTBOOK OF MEDICAL PHYSIOLOGY - GEETHA)', 'role': 'assistant'}]