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
[{'content': 'Which is the most common cause of bowel obstruction \nSelect and explain. \nA. Hernia, B. Ulcers causing obstruction, C. Adhesions, D. Structure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Adhesion will cause dynamic bowel obstruction', 'role': 'assistant'}]