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: Medicine
[{'content': 'What diagnosis is suggested by this barium swallow? \nSelect and explain. \nA. Ingested foreign body, B. Esophageal diverticula, C. Diffuse esophageal spasm, D. Gastric linitis plastica', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer C. Diffuse esophageal spasmRadiographs of the esophagus that were performed with the use of barium contrast material showed a spiral formation of the barium column up to the cervical esophagus, most consistent with diffuse esophageal spasm.', 'role': 'assistant'}]