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': 'Sandwich technique consists of: \nSelect and explain. \nA. GIC and composite, B. Amalgam and GIC, C. Amalgam and composite, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]