This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal Obstruction, Subject name: Surgery
[{'content': 'Which of the following causes Adynamic intestinal obstruction? \nSelect and explain. \nA. Gall stones, B. Bands, C. Intussusception, D. Paralytic ileus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans: D (Paralytic ileus) Ref: The Washington Manual of Surgery, 6th edition, Bailey and Love's Short Practice of Surgery 25th Edition & Schwartz's Principles of Surgery, 9th EditionExplanation:Intestinal obstructionDefn: Lack of transit of intestinal contentsClassification according to pathology Dynamic: Where peristalsis is working against a mechanical obstructionAdynamic: Where there is absence of peristalsis without obstructionAbsent peristalsis (eg: Paralytic ileus)Non-propulsive form (ef: Mesenteric vascular occlusion. Pseudo-obstruction)Causes of Dynamic Intestinal ObstructionIntraluminal causesImpacted stoolsForeign bodiesBezoarsGall stonesAscariasisMeconium ileusIntramural causesAtresiaInflammatory stricture - TB, Crohn's diseaseMalignant stricture - Ca Colon, GISTExtramural causesIntraperitoneal bands and adhesionsHerniaVolvulusIntussusception", 'role': 'assistant'}]