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: Surgery
[{'content': 'Egg shell pattern on X-ray abdomen may be seen in: \nSelect and explain. \nA. Testicular torsion, B. Hydrocele, C. Meconium ileus, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: In patients with complicated meconium ileus, intraperitoneal calcifications form, producing an eggshell pattern on plain abdominal radiograph. Ref: Schwaz's principle of surgery 9th edition, chapter 39.", 'role': 'assistant'}]