input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The most common mode of spread of retinoblastoma:   (A) Optic nerve invasion   (B) Lymphatics   (C) Vascular   (D) Direct invasion
output: ['(A) Optic nerve invasion <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Optic nerve invasion  (B) Lymphatics  (C) Vascular  (D) Direct invasion <> possible answers', '  The most common mode of spread of retinoblastoma: <> context']