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
Primary master cone of GP point used for obturation of root canals is defined as: 
Select and explain. 
A. Cone with snug-fit, B. Cone selected by the master staff, C. Cone with loose fit, D. Cone that matches initial instruments
A: Cone with snug-fit
Answer: A: Cone with snug-fit 
Explanation: Following the canal preparation, select the master gutta-percha cone whose diameter is same as that of master apical file. 
One should feel the tug back (snug-fit) with master gutta-percha point.