The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Schielder principle is   (A) Minimal enlarged apical foramen   (B) Shape of the canal can be changed   (C) Use of 3-5 times larger than first binding file   (D) Original canal curvature should be altered to make it compatible with obturating material
['(A) Minimal enlarged apical foramen <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Minimal enlarged apical foramen \n (B) Shape of the canal can be changed \n (C) Use of 3-5 times larger than first binding file \n (D) Original canal curvature should be altered to make it compatible with obturating material <> possible answers', '  Schielder principle is <> context@']