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
About 6 - 8 hours after peptic perforation the disappearance of abdominal wall rigidity is due to - 
Select and explain. 
A. Cessation of acid secretion in the stomach, B. Revival from initial shock, C. Dilution of acid in the peritonial cavity, D. Fatigue of reflex arc.
C: Dilution of acid in the peritonial cavity
Answer: C: Dilution of acid in the peritonial cavity 
Explanation: None