Calcified canal is explored with all of the given instruments except:: (A) 6 K file, (B) C+ file, (C) 10 K file, (D) Profinder
Answer is C. Canal exploration: 8, 10 K file used. 
In calciﬁed canal exploration: 6 K ﬁle, C+ ﬁle, proﬁnder.