This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'In an epidemic, the 1st step is \nSelect and explain. \nA. Verification of diagnosis, B. Isolation, C. Immunization, D. Notification', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The steps in an epidemic investigation are :Verification of diagnosisConfirmation of the existence of the epidemicDefining the population at riskObtaining a map of the areaCounting the populationRapid search for all cases & their characteristicsMedical surveyEpidemiological case sheetSearching for more casesData analysisFormulation of hypothesisEvaluation of ecological factorsFuher investigation of the population at riskWriting the repo', 'role': 'assistant'}]