This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiological Study, Subject name: Social & Preventive Medicine
Migration studies explains - 
Select and explain. 
A. Distribution of disease, B. Genetic factors affecting disease, C. Social status of immigrants, D. None of the above
B: Genetic factors affecting disease
Answer: B: Genetic factors affecting disease 
Explanation: Ans. is 'b' i.e., Genetic factors affecting disease o Migration study (migrant study) is a method to evaluate role of possible genetic and environmental factors in the occurrence of disease in a population whose incidence varies in different Geographic areas.