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 objective of the access cavity preparation is to gain direct access to 
Select and explain. 
A. Pulp chamber, B. Canal orifice, C. Apical foramen, D. Middle third of the canal
C: Apical foramen
Answer: C: Apical foramen 
Explanation: None