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
In an epidemic first to be done is - 
Select and explain. 
A. Identity the cases, B. Confirm the diagnosis, C. Identify The prone people, D. Identify the causative factors
B: Confirm the diagnosis
Answer: B: Confirm the diagnosis 
Explanation: verification of diagnosis is the first step in the investigation of an epidemic.it is necessary to examine all cases before arriving at a diagnosis.a clinical examination of a sample of cases may suffice.laboratary investigations can also be employed in such way that it is not delaying any of the epidemiological investigations concerned. ref:park&;s textbook,ed22,pg no 123