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
Commonest cause of acute intestinal obstruction is: 
Select and explain. 
A. Adhesions, B. Volvulus, C. Inguinal hernias, D. Internal hernias
A: Adhesions
Answer: A: Adhesions 
Explanation: 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.