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': 'Shag Carpet appearance is associated with \nSelect and explain. \nA. MTA, B. Dentin Bonding agent, C. Amalgam, D. Composite', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Microscopic appearance of substrate dentin and etchant is known as Shag Carpet Appearance.', 'role': 'assistant'}]