This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
What is the analysis of routine measurement aimed at detecting changes in the environment known as? 
Select and explain. 
A. Monitoring, B. Surveillence, C. Isolation, D. RCT
A: Monitoring
Answer: A: Monitoring 
Explanation: Monitoring is the performance and analysis of routine measurements aimed at detecting changes in the environment or health status of the population. It also refers to the on-going measurement of performance of a health service or a health professional. Ref: Park's Textbook of Preventive and Social Medicine; 24th edition - Page no. 44