input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Maximum contribution to the refractive power of the eye is by which pa of the eye?   (A) Anterior surface of cornea   (B) Posterior surface of cornea   (C) Anterior surface of lens   (D) Posterior surface of lens
output: ['(A) Anterior surface of cornea <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Anterior surface of cornea  (B) Posterior surface of cornea  (C) Anterior surface of lens  (D) Posterior surface of lens <> possible answers', '  Maximum contribution to the refractive power of the eye is by which pa of the eye? <> context']