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 designing the occlusal rest seat, the floor of the rest\nseat should be inclined towards the \nSelect and explain. \nA. Buccal surface, B. Centre of the tooth, C. Lingual surface, D. Marginal ridge', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]