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
Point at which pulp tissue ends and periodontal tissue begins is known as 
Select and explain. 
A. Accesory canal, B. Cementoenamel junction, C. Cementodentinal junction, D. Dentinoenamel junction
C: Cementodentinal junction
Answer: C: Cementodentinal junction 
Explanation: None