This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': "Worm like filling defect is seen In \nSelect and explain. \nA. Erosive gastritis, B. Esophageal varices, C. CA esophagus, D. Schatzki's ring", 'role': 'user'}, {'content': 'Answer: B \nExplanation: On USG Thickened sinus, interrupted mucosal folds (earliest sign) Toous radiolucencies of variable size The "worm-eaten" smooth lobulated filling defects Ref: Wolfgang Radiology 2nd edition Pg no : 509', 'role': 'assistant'}]