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: Microbiology
Apa from Escherichia colt, the other most common organism implicated in acute suppurative bacterial peritonitis is: 
Select and explain. 
A. Bacteroides, B. Klebsiella, C. Peptostreptococcus, D. Pseudomonas
B: Klebsiella
Answer: B: Klebsiella 
Explanation: Ans. (b) Klebsiella [Ref CSDT 13/e, p 465; Harrison 18/e, p 1078, 19/e, p 846) Causative organism of acute bacterial peritonitis: Aerobic (30%) Anaerobic (10%) E. coli (MC) * Bacteroides Klebsiella * Peptostreptococci Enterococci Remember: In 60% of cases mixed anaerobic and aerobic infection is found.