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: Medicine
[{'content': 'True about clostridium difficile is: \nSelect and explain. \nA. Gram negative, B. Obligatory aerobic, C. Spore forming cocci, D. None of the above is true', 'role': 'user'}, {'content': 'Answer: D \nExplanation: C. difficile: 1. Gram positive 2. Obligately anaerobic 3. Spore-forming bacillus (spores are found widely in nature)', 'role': 'assistant'}]