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': 'Vagabond disease \nSelect and explain. \nA. Louse, B. Mite, C. Tick, D. Black Fly', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Louse Vagabond's disease is pediculosis eorporis, caused by body louse.", 'role': 'assistant'}]