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': 'Rat flea transmits all the following except - \nSelect and explain. \nA. Plague, B. Salmonellosis, C. Hymenolopsis, D. Endemic typhus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Rat flea transmits disease by biting, mechanical transmission and by faeces. They transmit Plague, Endemic or murine typhus, Chiggerosis Hymenolepis diminuta. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 838", 'role': 'assistant'}]