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
Cohort study is which type of study - 
Select and explain. 
A. Descriptive observational, B. Analytic observational, C. Experimental, D. Controlled trial
B: Analytic observational
Answer: B: Analytic observational 
Explanation: Ans. is 'b' i.e., Analytic observational StudyUnit of study1.Observational studies A) Descriptive studies (formation of hypothesis) i) Case reportsii) Case series B) Analytic studies (testing of hypothesis) i) Case - control or case - referenceii) Cohort or follow-upiii) Ecological or correlational studyiv) Cross-sectional or pravalence studyIndividualsIndividualsPopulationIndividuals2.Experimental / intervention studies (testing of hvpothesis) i) Randamized controlled / clinical trialsii) Field trials or community intervention studiesiii) Community trialsiv) Animal studiesPatientsHealthy peopleCommunities