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
Which of the following grooves separates cusp ridges from marginal ridges? 
Select and explain. 
A. Supplemental, B. Developmental, C. Mesio marginal developmental, D. Marginal ridge developmental
B: Developmental
Answer: B: Developmental 
Explanation: None