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': 'Which of the following disease is transmitted by rat flea ? \nSelect and explain. \nA. Trench fever, B. Chages disease, C. Oriental sore, D. Endemic typhus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Endemic typhus", 'role': 'assistant'}]