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
Recurrent pain abdomen with intestinal obstruction and mass passes per rectum goes in our of ? 
Select and explain. 
A. Internal herniation, B. Stricture, C. Strangulated hernia, D. Intussusception
D: Intussusception
Answer: D: Intussusception 
Explanation: Answer is 'd' i.e. Intussception