question: Q:A 61-year-old man comes to the physician because of a 2-month history of a cough productive of clear mucoid sputum. He has smoked one pack of cigarettes daily for 33 years. Physical examination shows no abnormalities. Chest x-ray shows a 2-cm solid nodule in the periphery of the lower left lobe. A bronchial biopsy of the mass shows numerous mucin-filled epithelial cells lining the alveolar basement membrane. The cells have prominent nucleoli, coarse chromatin, and some cells have multiple nuclei. Which of the following is the most likely diagnosis?? 
  {'A': 'Small cell carcinoma', 'B': 'Pulmonary hamartoma', 'C': 'Adenocarcinoma in situ', 'D': 'Carcinoid tumor', 'E': 'Endobronchial tuberculosis'},