input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 61-year-old man comes to the physician with several months of sharp, shooting pain in both legs. Twenty years ago, he had a painless ulcer on his penis that resolved without treatment. He has no history of serious illness. Examination shows small pupils that constrict with accommodation but do not react to light. Sensation to pinprick and light touch is decreased over the distal lower extremities. Patellar reflexes are absent bilaterally. His gait is unsteady and broad-based. This patient is at increased risk for which of the following complications?   (A) Atrioventricular block   (B) Mitral valve regurgitation   (C) Penile squamous cell carcinoma   (D) Thoracic aortic aneurysm
output: ['(D) Thoracic aortic aneurysm <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Atrioventricular block  (B) Mitral valve regurgitation  (C) Penile squamous cell carcinoma  (D) Thoracic aortic aneurysm <> possible answers', '  A 61-year-old man comes to the physician with several months of sharp, shooting pain in both legs. Twenty years ago, he had a painless ulcer on his penis that resolved without treatment. He has no history of serious illness. Examination shows small pupils that constrict with accommodation but do not react to light. Sensation to pinprick and light touch is decreased over the distal lower extremities. Patellar reflexes are absent bilaterally. His gait is unsteady and broad-based. This patient is at increased risk for which of the following complications? <> context']