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': 'Least cariogenic among these: \nSelect and explain. \nA. Raw starch., B. Cooked starch., C. Sucrose., D. Fructose', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]