question: Q:A 40-year-old man presents to the physician for a pre-employment medical check-up. He has no symptoms and his past medical history is insignificant. He is a non-smoker. His temperature is 36.9°C (98.4°F), the heart rate is 76/min, the blood pressure is 124/82 mm Hg, and the respiratory rate is 16/min. His general and systemic examination does not reveal any abnormality. Laboratory evaluation is completely normal; however, his chest radiogram shows a single irregularly shaped nodule in the upper lobe of his right lung. The nodule has circumscribed margins and appears to be surrounded by normally aerated lung parenchyma. The nodule is approx. 7 mm (0.28 in) in diameter. The pattern of calcification is nonspecific and there are no signs of atelectasis or pneumonitis. The physician compares the radiogram with another radiogram which was obtained 5 years back. However, there was no pulmonary nodule in the previous radiogram. No other radiograms are available for comparison. Which of the following is the next best step in the diagnostic evaluation of this patient?? 
  {'A': 'Thin-section computed tomography (CT) through the nodule', 'B': 'Positron emission tomography (PET) scan', 'C': 'Single-photon emission CT (SPECT) scan', 'D': 'CT-guided transthoracic needle aspiration (TTNA)', 'E': 'Transbronchial needle aspiration (TBNA)'},