input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 46-year-old woman presents with a 5-month history of worsening dry cough, occasional shortness of breath, and fatigue. She says she is now having trouble walking a full block. For the past week, she also has noticed bilateral swelling of the lower legs. She denies chest pain, fever, chills, syncope, or bloody sputum. Current vitals include: temperature 37.0°C (98.6°F), pulse 63/min, blood pressure 128/91 mm Hg and respiratory rate 15/min. On physical examination, there is elevated jugular venous pressure, decreased breath sounds bilaterally at the lung bases, and 1+ non-pitting edema bilaterally in the lower extremities. A chest X-ray demonstrates a slightly enlarged cardiac silhouette. Which of the following is the most appropriate next step in the diagnosis of this patient?   (A) Bronchoalveolar wash   (B) Pulmonary function studies   (C) Echocardiography   (D) Chest CT
output: ['(C) Echocardiography <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Bronchoalveolar wash  (B) Pulmonary function studies  (C) Echocardiography  (D) Chest CT <> possible answers', '  A 46-year-old woman presents with a 5-month history of worsening dry cough, occasional shortness of breath, and fatigue. She says she is now having trouble walking a full block. For the past week, she also has noticed bilateral swelling of the lower legs. She denies chest pain, fever, chills, syncope, or bloody sputum. Current vitals include: temperature 37.0°C (98.6°F), pulse 63/min, blood pressure 128/91 mm Hg and respiratory rate 15/min. On physical examination, there is elevated jugular venous pressure, decreased breath sounds bilaterally at the lung bases, and 1+ non-pitting edema bilaterally in the lower extremities. A chest X-ray demonstrates a slightly enlarged cardiac silhouette. Which of the following is the most appropriate next step in the diagnosis of this patient? <> context']