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
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: Ans. is 'a' i.e., Adhesion