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: Social & Preventive Medicine
[{'content': 'Quarantine was originally introduced as a protection against \nSelect and explain. \nA. Plague, B. Tuberculosis, C. AIDS, D. Malaria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In 14th century ‘quarantine’ was introduced in Europe to protect against importation of Plague\nShips, crews, travelers were detained for a ‘40 day period’', 'role': 'assistant'}]