This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'X-ray below demonstrates \nSelect and explain. \nA. Small bowel obstruction, B. Sigmoid volvulus, C. Large bowel obstruction, D. Perforation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Small Bowel Obstruction* Multiple air fluid levels seen here is due to small bowel obstruction.* This appearance is known as Step ladder appearance', 'role': 'assistant'}]