This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Which of the following bacteria shows this test positive? \nSelect and explain. \nA. E coli, B. Klebsiella, C. Proteus mirabilis, D. Proteus Edwardsiella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Klebsiella,Proteus mirabilis show indole test negative showing yellow ring Red ring-positive- e.g.: E coli, Proteus other than mirabilis, Edwardsville Ref: Textbook of Microbiology Baveja 5th ed Pg 53', 'role': 'assistant'}]