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: Pathology
[{'content': 'Animals maintained in a germ free environment did not\ndevelop caries even when fed on a high carbohydrate diet is given by: \nSelect and explain. \nA. Gottlieb, B. Miller, C. Snyder, D. Orland and Fizgerald', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]