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
Three cusps arranged in triangle form: 
Select and explain. 
A. Tritubercular stage, B. Triconodont, C. Buonodont, D. Polyphyodont
A: Tritubercular stage
Answer: A: Tritubercular stage 
Explanation: In tritubercular stage 3 cusps are arranged in triangular form.