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
Which of the following causes least irritation of peritoneal cavity? 
Select and explain. 
A. Bile, B. Blood, C. Pancreatic enzymes, D. Gastric juice
B: Blood
Answer: B: Blood 
Explanation: Gastric juice, pancreatic juice, bile, urine and meconium irritate the peritoneum and leads to aseptic (or chemical) peritonitis. Ref: Maingot's 10/e, Page 637.