67-year-old male with a 2-month history of weight loss and anorexia

You are seeing a 67-year-old male with a 2-month history of weight loss and anorexia. He denies any pain but says that over the past few months he had no exercise endurance. He has no appetite and often feels nauseated at the sight of food. He denies melena, abdominal pain, constipation, dyspnea, chills, or fevers. He is a heavy smoker and used to drink three bottles of beer every day for the past 45 years. He has no other significant history and the family history is unremarkable. The head, neck and chest exam are unremarkable. Examination of the abdomen reveals moderate tenderness to palpation around the umbilicus. The lesion is 2 x 3 cm, hard and irregular. Squeezing the nodule results in a serous discharge. Based on this history and physical exam, the next investigation of choice will be-

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A. Barium enema
B. Upper endoscopy
C. Ultrasound of the abdomen
D. Chest x-ray