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
Elevated occlusal portion of a tooth which divides occlusal surface is known as: 
Select and explain. 
A. Cusp., B. Ridge., C. Tubercle., D. Cingulum.
B: Ridge.
Answer: B: Ridge. 
Explanation: Ridges like transverse ridge or oblique ridges are the alevated occlusal portion of a tooth which divides occlusal surface.