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': 'The major intestinal pathogens which are non-Lactose fermenters are: \nSelect and explain. \nA. Salmonella, B. Klebsiella, C. Escherichia, D. Paracolons', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]