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': 'Type IIa GIC is used for: \nSelect and explain. \nA. Luting crowns, bridges and orthodontic brackets, B. Esthetic restorative cements, C. Reinforced restorative cements, D. Lining cements', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Type I: Luting crowns, bridges, and orthodontic brackets.\nType IIa: Esthetic restorative cements.\nType IIb: Reinforced restorative cements.\nType III: Lining cements, base.\nRef: Phillip’s Science of Dental Materials ed 12 pg 320', 'role': 'assistant'}]