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
The type of study that determines the norms and limits of the distribution of variables, including the characteristics of the events and population under study, is reffered to as- 
Select and explain. 
A. Explanatory, B. Cross-sectional, C. Descriptive, D. Analytical
C: Descriptive
Answer: C: Descriptive 
Explanation: Descriptive studies are the first phase of an epidemiological investigation. Procedures in descriptive studies include: 1)defining the population to be studied 2)defining the disease under study 3)describing the study by time , place, person 4)measurement of disease 5)comparing with known indices 6)formulation of an aetiological hypothesis (refer pgno:63 park 23 rd Edition)