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': 'Investigation for small intestine includes all except: \nSelect and explain. \nA. Enteroclysis, B. Radionucleide scan, C. CT enteroclysis, D. USG enteroclysis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. USG enteroclysis', 'role': 'assistant'}]