input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Most advantageous indication of acid etching is   (A) Decrease micro leakage   (B) Decrease polymerization shrinkage   (C) Decrease coefficient of thermal expansion   (D) Decrease porosity in restorative material
output: ['(A) Decrease micro leakage <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Decrease micro leakage  (B) Decrease polymerization shrinkage  (C) Decrease coefficient of thermal expansion  (D) Decrease porosity in restorative material <> possible answers', '  Most advantageous indication of acid etching is <> context']