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
Animals maintained in a germ free environment did not
develop caries even when fed on a high carbohydrate diet is given by: 
Select and explain. 
A. Gottlieb, B. Miller, C. Snyder, D. Orland and Fizgerald
D: Orland and Fizgerald
Answer: D: Orland and Fizgerald 
Explanation: None