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 grooves separates cusp ridges from marginal ridges? \nSelect and explain. \nA. Supplemental, B. Developmental, C. Mesio marginal developmental, D. Marginal ridge developmental', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]