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': 'What are fly belts? \nSelect and explain. \nA. Insecticide impregnated belts to ward off tse tse flies, B. Regions infested with tse tse flies, C. Sticky paper strips to catch flies, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Regions of Africa are ravaged by tse tse flies. Such regions infested with flies are known as fly belts. Chapter: Environment and health Ref: Park 21st edition page: 716', 'role': 'assistant'}]