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': 'Which of the following is false about glass ionomer cement? \nSelect and explain. \nA. Acid treatment of the tooth surface is required before placement, B. Poor marginal seal, C. Low fracture resistance, D. Has ability to renew broken ionic bonds', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The\xa0adhesion\xa0of\xa0GIC\xa0to dentin reduces the probability of gap formation at gingival margins located in dentin or cementum, compensating for the polymerization shrinkage of the overlying resin-based composite restoration on the hybrid ionomer base.\nRef: Phillip’s Science of Dental Materials ed 12 pg 327', 'role': 'assistant'}]