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': 'Analysis of routine measurement aimed at detecting changes in the environment? \nSelect and explain. \nA. Surveillance, B. Isolation, C. Monitoring, D. RCT', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Monitoring is the performance and analysis of routine measurements aimed at detecting changes in the environment or health status of population.', 'role': 'assistant'}]