This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': 'Barium follow through is used for \nSelect and explain. \nA. Esophagus, B. Stomach and duodenum, C. Small intestine, D. Colon and rectum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Barium swallow - Esophagus\nBarium meal - Stomach and duodenum\nBarium follow through - Small intestine\nBarium enema - Colon and rectum.', 'role': 'assistant'}]