This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal obstruction, Subject name: Surgery
[{'content': 'Coffee bean sign is usually seen in: \nSelect and explain. \nA. Volvulus, B. Pyloric obstruction, C. Intussusception, D. Intestinal obstruction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Coffee bean sign is usually seen in Sigmoid Volvulus.', 'role': 'assistant'}]