input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The principal reason for placing an aluminium filter in the primary beam of radiation is to:   (A) Reduce exposure time   (B) Decrease development time of the films   (C) Reduce radiation to the skin of the patient   (D) Obtain greater definition of the images of teeth
output: ['(C) Reduce radiation to the skin of the patient <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Reduce exposure time  (B) Decrease development time of the films  (C) Reduce radiation to the skin of the patient  (D) Obtain greater definition of the images of teeth <> possible answers', '  The principal reason for placing an aluminium filter in\nthe primary beam of radiation is to: <> context']