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
Population - based registries are better than hospital -based registries because they ? 
Select and explain. 
A. May be used for etiological studies, B. Help in assesing the effectiveness of control programme, C. Measure the burden of disease in a defined population, D. All of these
D: All of these
Answer: D: All of these 
Explanation: Ans. is 'a, b & c' i.e., May be used for etiological studies 'b' i.e., Help in assesing the effectiveness of control programme & 'c' i.e., Measure the burden of disease in a defined population The cancer registry is an organization for the systematic collection, storage, analysis, interpretation and repoing of data on subjects with cancer. There are two main types of cancer registry : hospital - based and population based cancer registries.