This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
An 84-year-old man has had a reducible hernia in the right groin for 17 years. One day before admission to the hospital, he complains of abdominal pain; because of the swelling, the hernia has become irreducible. At operation, part of the wall of the cecum is noted to form a portion of the hernia sac. What is the hernia? 
Select and explain. 
A. Appendix, B. Hydrocele, C. Sliding hernia, D. Bladder
C: Sliding hernia
Answer: C: Sliding hernia 
Explanation: In this variety, the hernia does not have a complete covering of peritoneum. It is called a sliding hernia. It is important that the surgeon does not attempt to remove peritoneum from the circumference bowel wall where it does not exist, because the bowel will become devascularized.