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
The cementoenamel junction is approximately at the level at which the root canal becomes 
Select and explain. 
A. Twisted, B. Curved, C. Pulp chamber, D. Lateral canal
C: Pulp chamber
Answer: C: Pulp chamber 
Explanation: None