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': 'Preparation of class I cavities for dental amalgam, direct filling gold or gold inlays have in common \nSelect and explain. \nA. Occlusally diverging facial and lingual walls, B. Occlusally diverging mesial and distal walls, C. Occlusally converging facial and lingual walls, D. Occlusally converging mesial and distal walls', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]