input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** At physiological pH, which of these amino acids has a positive charge?   (A) Valine   (B) Aspaic acid   (C) Arginine   (D) Isoleucine
output: ['(C) Arginine <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Valine  (B) Aspaic acid  (C) Arginine  (D) Isoleucine <> possible answers', '  At physiological pH, which of these amino acids has a positive charge? <> context']