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': 'The sandwich technique is recommended for: \nSelect and explain. \nA. Class II composite restorations, B. Class V composite restoration, C. Class III composite restoration, D. Both 1 and 2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: This sandwich technique is recommended for Class II and V composite restorations when individual patients are at a moderate to high risk for caries.\nRef: Phillip’s Science of Dental Materials ed 12 pg 327', 'role': 'assistant'}]