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
Most common cause of small intestinal obstruction in adults is 
Select and explain. 
A. Malignancy, B. Crohn's disease, C. Hernia, D. Adhesions
D: Adhesions
Answer: D: Adhesions 
Explanation: Adhesions account for more than 50% of small intestine obstruction. They follow appendicitis or other pelvic operations.