input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Main cause of RPD failure is:   (A) Improper clasp design   (B) Insufficient contact of teeth   (C) Insufficient contact of teeth and improper clasp design   (D) None of the above
output: ['(C) Insufficient contact of teeth and improper clasp design <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Improper clasp design  (B) Insufficient contact of teeth  (C) Insufficient contact of teeth and improper clasp design  (D) None of the above <> possible answers', '  Main cause of RPD failure is: <> context']