This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Due to recent advances in Health care system, quarantine has been replaced nowadays by: \nSelect and explain. \nA. Active surveillance, B. Passive surveillance, C. Sentinel surveillance, D. Isolation', 'role': 'user'}, {'content': "Answer: A \nExplanation: Quarantine has been replaced with active surveillance. Quarantine is the restriction of activities of apparently healthy persons who have been exposed to a case of communicable disease during its period of communicability, for the duration of it's maximum incubation period. Active surveillance is the continuous scrutiny of all aspects of a disease and application of information to heath promotion and to disease prevention and control.", 'role': 'assistant'}]