The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Kroll designed   (A) RPI clasp   (B) Bar clasp   (C) Circumferential clasp   (D) Altered clasp
['(A) RPI clasp <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) RPI clasp \n (B) Bar clasp \n (C) Circumferential clasp \n (D) Altered clasp <> possible answers', '  Kroll designed <> context@']