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': 'Coiled spring appearance on barium enema is seen in: \nSelect and explain. \nA. Carcinoma colon, B. Sigmoid volvulus, C. Intussusception, D. Deal atresia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Intussusception', 'role': 'assistant'}]