This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Case series report is a type of - 
Select and explain. 
A. Analytic study, B. Experimental study, C. Observational study, D. Intervention study
C: Observational study
Answer: C: Observational study 
Explanation: Ans. is 'c' i.e., Observational study A) Observational studiesi) Descriptive studies : Case reports, case series.ii) Analytic studies: Case-control (case-reference), Cohort (follow-up), Ecological (correlational), Cross-sectional.B) Experimental/intervention studiesi) Randomized controlled trials/clinical trials. ii) Field trials.iii) Community trials.iv) Animal studies.