input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 63-year-old woman comes to the physician because of a 6-month history of fatigue and shortness of breath on exertion in addition to a 1-month history of ankle swelling. She has a history of sleep apnea. Examination of the lower extremities shows bilateral pitting pedal and ankle edema. Cardiac examination shows a widely split S2 that varies with respiration. An ECG shows right bundle branch block. Which of the following is the most likely etiology of the patient's lower extremity edema?   (A) Localized lymphatic obstruction   (B) Thrombus formation in a deep vein   (C) Increased capillary hydrostatic pressure   (D) Decreased plasma oncotic pressure "
output: ['(C) Increased capillary hydrostatic pressure <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Localized lymphatic obstruction  (B) Thrombus formation in a deep vein  (C) Increased capillary hydrostatic pressure  (D) Decreased plasma oncotic pressure" <> possible answers', "  A 63-year-old woman comes to the physician because of a 6-month history of fatigue and shortness of breath on exertion in addition to a 1-month history of ankle swelling. She has a history of sleep apnea. Examination of the lower extremities shows bilateral pitting pedal and ankle edema. Cardiac examination shows a widely split S2 that varies with respiration. An ECG shows right bundle branch block. Which of the following is the most likely etiology of the patient's lower extremity edema? <> context"]