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': 'In pin retained amalgam restoration, failure is more likely to occur at the \nSelect and explain. \nA. Pin restoration interface, B. Pin dentin interface, C. Both of the above, D. Inside of restoration (Restoration fracture)', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]