This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, 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: parks textbook of preventive and social medicine 23rd edition *rat fleas are known to transmit the following diseases :bubonic plague,endemic or murine typhus,chiggerosis,hymenolepis diminuta.', 'role': 'assistant'}]