This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestine, Subject name: Medicine
[{'content': 'Which of the following is the most probable diagnosis of this X ray abdomen? \nSelect and explain. \nA. Gas under diaphragm- peritonitis, B. Multiple air fluid level- adhesions and bands, C. Bird beak - volvulus, D. Normal X ray PA view', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Multiple air fluid level- adhesions and bandsRef.: Manual of emergency medicine 5th ed/247* In X ray you can see that due to intestinal obstruction secondary to adhesions or bands, the loops^proximal to the point of obstruction will become dilated and fluid- filled and are usually greater than 2.5-3 cm in size* Absence of, or disproportionately smaller amount of, gas in the colon, especially the recto-sigmoid.* Loops of small bowel may arrange themselves in a step- ladder configuration from the left upper to the right lower quadrant in a distal SBO* Mostly fluid-filled loops of bowel may demonstrate a string-of-beads sign caused by the small amount of visible air in those loops', 'role': 'assistant'}]