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
Dentinogenesis by odontoblasts first begins at 
Select and explain. 
A. Pulpal end, B. Cusp tip, C. Tooth bud stage, D. Cervical area
B: Cusp tip
Answer: B: Cusp tip 
Explanation: None