input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Tooth structure cutting is preceded by crack propogation due to tensile forces known as:   (A) Brittle fracture   (B) Ductile fracture   (C) Shear fracture   (D) All of the above
output: ['(A) Brittle fracture <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Brittle fracture  (B) Ductile fracture  (C) Shear fracture  (D) All of the above <> possible answers', '  Tooth structure cutting is preceded by crack propogation due to tensile forces known as: <> context']