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
Working cusps are also known as: 
Select and explain. 
A. Guiding cusps., B. Supporting cusps., C. Holding cusps., D. Balancing cusps.
B: Supporting cusps.
Answer: B: Supporting cusps. 
Explanation: None