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
[{'content': 'Migration study is used to study \nSelect and explain. \nA. Sociodemographic reasons for migration of a population, B. Prevalence of disease in a population, C. Environmental and genetic factors in a disease in population, D. Diseases with long incubation period', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Large-scale migration of human populations from one country to another provides a unique oppounity to evaluate the role of the possible genetic and environmental factors in the occurrence of disease in a population.Migration studies can be carried out in 2 ways -a) Comparision of disease and death rates for migrants with that kin who have stayed at home. (Genetically similar groups living in different environmental conditions)b) Comparision of migrants with the local population of the host country. (genetically different groups living in the same environment)Park 23e pg: 67', 'role': 'assistant'}]