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': '"Bird of Prey" sign is seen in the radiographic barium examination of: \nSelect and explain. \nA. Gastric volvulus, B. Intussusception, C. Sigmoid volvulus, D. Cecal volvulus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sigmoid volvulus', 'role': 'assistant'}]