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
What is primary G.P. point: 
Select and explain. 
A. Master point, B. Paper point, C. Initial file taken for working length determination., D. None of the above.
A: Master point
Answer: A: Master point 
Explanation: The primary G.P. point used to seal the canal is called Master point or primary emulsion.