question: Q:A previously healthy 42-year-old man is brought to the emergency department 1 hour after he was involved in a motor vehicle collision. He is conscious. He smoked one pack of cigarettes daily for 16 years but quit 8 years ago. Physical examination shows several ecchymoses over the trunk and abdomen. The abdomen is soft, and there is tenderness to palpation of the right upper quadrant without guarding or rebound. Vital signs are within normal limits. An x-ray of the chest shows no fractures; a 10-mm solid pulmonary nodule is present in the central portion of the right upper lung field. No previous x-rays of the patient are available. A CT scan of the chest is performed, which shows that the nodule has irregular, scalloped borders. Which of the following is the most appropriate next step in the management of this patient's pulmonary nodule?? 
  {'A': 'Antituberculous therapy', 'B': 'Positron emission tomography', 'C': 'Follow-up chest x-ray in 12 months', 'D': 'Follow-up CT scan in 12 months', 'E': 'Reassurance'},