input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is true about master apical file?   (A) The last file which is selected for the obturation   (B) The initial file which is selected for initial radiographic working length   (C) The smaller file used in between the other file during biomechanical preparation   (D) The last file which is used for removal of soft debris from root canal
output: ['(A) The last file which is selected for the obturation <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) The last file which is selected for the obturation  (B) The initial file which is selected for initial radiographic working length  (C) The smaller file used in between the other file during biomechanical preparation  (D) The last file which is used for removal of soft debris from root canal <> possible answers', '  Which of the following is true about master apical file? <> context']