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': "'Thumb print' appearance on Barium enema is found in: September 2003 \nSelect and explain. \nA. Volvulus, B. Gastric ulcer, C. Bowel ischemia, D. Intussusception", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. Bowel ischemia', 'role': 'assistant'}]