This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Swarming is seen in: \nSelect and explain. \nA. Clostridium perfringens, B. Clostridium tetani, C. Clostridium botulinum, D. Clostridium difficile', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Clostridium tetaniSwarming/ spreading type of growth is seen in many bacteria i.e. Proteus, Clostridium tetani, Vibrio parahemolyticus etc.', 'role': 'assistant'}]