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': "Dienes' phenomena is seen with -a) Proteus mirabilisb) Klebsiellac) Proteus vulgarisd) Providentiae) Morganella \nSelect and explain. \nA. a, B. ac, C. ad, D. b", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]