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': 'Commonest cause of acute intestinal obstruction is: \nSelect and explain. \nA. Adhesions, B. Volvulus, C. Inguinal hernias, D. Internal hernias', 'role': 'user'}, {'content': "Answer: A \nExplanation: SMALL BOWEL OBSTRUCTION - Adhesions secondary to previous surgery are the MC cause of SBO. - Causes: Adhesions (60%) > Malignant tumors (20%) >Hernia (10%) > Crohn's disease (5%)Q. - Primary colonic cancers (paicularly those arising from the cecum and ascending colon) may present as a SBO.", 'role': 'assistant'}]