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': 'Phenylalanine deaminase test is positive in ? \nSelect and explain. \nA. Salmonella, B. Proteus, C. Vibrio cholerae, D. Helicobacter', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Proteus The distinctive character of proteus genus is deamination of phenyl alanine to phenyl pyruvic acid (PPA + ye)", 'role': 'assistant'}]