This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: RCT, Trials, Subject name: Social & Preventive Medicine
[{'content': 'Father of Evidence Based Medicine is: \nSelect and explain. \nA. Sackett, B. Da vinci, C. Hippocrates, D. Tolstoy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Father of Evidence based medicine (EBM): David Lawrence Sackett founded first Depament of Clinical Epidemiology in Canada, founded Oxford Centre for EBM Wrote books: Clinical Epidemiology Evidence Based Medicine', 'role': 'assistant'}]