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
True about clostridium difficile is: 
Select and explain. 
A. Gram negative, B. Obligatory aerobic, C. Spore forming cocci, D. None of the above is true
D: None of the above is true
Answer: D: None of the above is true 
Explanation: C. difficile: 1. Gram positive 2. Obligately anaerobic 3. Spore-forming bacillus (spores are found widely in nature)