input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Supplementary retention on the abutment tooth is made possible by:   (A) Greater bulk of metal   (B) Proper cementation technique   (C) Shoulder preparation   (D) Proper use of pins and grooves
output: ['(D) Proper use of pins and grooves <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Greater bulk of metal  (B) Proper cementation technique  (C) Shoulder preparation  (D) Proper use of pins and grooves <> possible answers', '  Supplementary retention on the abutment tooth is made\npossible by: <> context']