This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Most common cause of bacterial peritonitis is 
Select and explain. 
A. Primary or spontaneous, B. Perforated viscus, C. Foreign body, D. Biliary peritonitis
B: Perforated viscus
Answer: B: Perforated viscus 
Explanation: Peritonitis secondary to any bowel or other visceral pathology eg. perforation, appendicitis is termed as secondary peritonitis, E-Coli is the commonest organism causing this. Primary peritonitis - there is no documented infection, it&;s monomicrobial, extraperitoneal postoperative leak after surgery for gallbladder, CBD, ERCP, duodenum, pyloroplasty Reference: SRB 5th edition page no.566,573