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
The most common cause of small intestinal obstruction is 
Select and explain. 
A. Intussusception, B. Iatrogenic adhesions, C. Trauma, D. Carcinoma
B: Iatrogenic adhesions
Answer: B: Iatrogenic adhesions 
Explanation: Causes of small bowel obstruction in order of frequency  : (Sabiston)
I. Adhesions (~60%) Commonest

Malignant tumors (20%) Second most common cause. Most commonly, these tumors are metastatic lesions
Hernias (~10%)
Crohn's disease (~5%)