input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Endontically treated posterior teeth are more susceptible to fracture than untreated one because:   (A) Loss of moisture.   (B) Hollow canals.   (C) Loss of coronal structure.   (D) All of the above.
output: ['(C) Loss of coronal structure. <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Loss of moisture.  (B) Hollow canals.  (C) Loss of coronal structure.  (D) All of the above. <> possible answers', '  Endontically treated posterior teeth are more susceptible to fracture than untreated one because: <> context']