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
In which one of the following type of hernia do the abdominal viscera from a pa of the wall of hernial sac? 
Select and explain. 
A. Pantaloon hernia, B. Sliding hernia, C. Richter's hernia, D. Indirect inguinal hernia
B: Sliding hernia
Answer: B: Sliding hernia 
Explanation: As a result of slipping of the posterior parietal peritoneum on the underlying retroperitioneal structures, the posterior wall of the sac in sliding hernia is not formed by peritoneum alone, but by the sigmoid colon and its mesentery on the left, the accident), is called magical thinking. This type of reasoning is typical of children in Piaget's preoperational stage (age 2-7 years).