This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Study of disease in a traveller from one part to another \nSelect and explain. \nA. Eugenics, B. Ergonomics, C. Emporiatrics, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]