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
To achieve the objectives of vertical condensation, it is necessary to produce: 
Select and explain. 
A. A cylindrical canal, B. A conical canal, C. A tapering conical canal, D. A straight canal
C: A tapering conical canal
Answer: C: A tapering conical canal 
Explanation: The root canal preparation should develop a continuously tapering cone. This shape mimics the natural canal shape. Funnel-shaped preparation of canal should merge with the access cavity so that instruments will slide into the canal. Thus, the access cavity and root canal preparation should form a continuous channel.
Textbook of endodontics, 3rd edition Nisha Garg, Amit Garg