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': '. Swarming growth on culture is characteristic of which Gram-negative organism? \nSelect and explain. \nA. Clostridium welchii, B. Clostridium tetani, C. Bacillus cereus, D. Proteus mirabilis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Proteus mirabilis Swarmin growth . Swarming growth is due to motility of bacteria. . In young culture discrete colonies are seen but thereafter actively motile cells spread on the surface of the plate in successive waves to form a thin filmy layer in concentric circles.", 'role': 'assistant'}]