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
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 
Select and explain. 
A. dc, B. cbe, C. bcd, D. eb
C: bcd
Answer: C: bcd 
Explanation: None