input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Characteristic of venous blood flow of lower limb in duplex Doppler is?   (A) Monophasic   (B) Biphasic   (C) Triphasic   (D) Non phasic
output: ['(A) Monophasic <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Monophasic  (B) Biphasic  (C) Triphasic  (D) Non phasic <> possible answers', '  Characteristic of venous blood flow of lower limb in duplex Doppler is? <> context']