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: Dental
[{'content': 'Hopewood house study is on \nSelect and explain. \nA. people eating large amounts of sugar, B. people eating small amounts of sugar, C. people not exposed to sugar, D. people eating moderate amounts of sugar', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]