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 positive organism ? \nSelect and explain. \nA. Clostridium welchii, B. Clostridium tetani, C. Bacillus cereus, D. Proteus mirabil is', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Clostridium tetani Swarming 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. . Gram positive organism showing swarming growth --> C. tetani and Bacillus cereus . Gram negative organism showing swarming growth -f Proteus mirabilis and proteus vulgaris", 'role': 'assistant'}]