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
Descriptive epidemiology is study in relation to- 
Select and explain. 
A. Time, B. Place, C. Person, D. All
D: All
Answer: D: All 
Explanation: . descriptive epidemilogy,it is regarded as the first phase of epidemiological investigations.the basic procedures in a descriptive study includes, 1.defining the poppulation at risk. 2.defining the disease under study. 3.describing the disease by time,place and person. 4.measurement of the disease. 5.comparing with known indices. 6.formulation of an aetiological hypothesis. ref:park&;s textbook,ed 22,pg no 60