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': 'Coffee bean sign is seen in – \nSelect and explain. \nA. Intus sus c eption, B. Bowel ischaemia, C. Sigmoid volvulus, D. Congenital hypertrophic pyloric stenosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Coffee bean sign is seen in sigmoid volvulus.', 'role': 'assistant'}]