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': 'Subterminal spores are found in- \nSelect and explain. \nA. Clostridium sordelli, B. Clostridium sporogenes, C. Clostridium difficile, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'a' i.e., Clostridium sordelli; 'b' i.e., Clostridium sporogenes; 'c' i.e., Clostridium difficile", 'role': 'assistant'}]