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: Microbiology
[{'content': 'Not true about Eltor vibrio 01- \nSelect and explain. \nA. Animals are the only reservoir, B. Epidemiologically indistinguisible from V. cholera O-139, C. Human acts as vehicle for spread, D. The efficacy of vaccine against Eltor vibrio is great', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]