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': 'About monitoring true is / are -a) Broader conceptb) Analysis of measurements for detecting changes in health statusc) An essential part of surveillanced) Smaller concepte) Continues after disease elimination \nSelect and explain. \nA. dc, B. cbe, C. bcd, D. eb', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]