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
Apa from Escherichia coli, the other most common organism implicated in acute suppurative bacterial peritonitis is- 
Select and explain. 
A. Bacteroides, B. Klebsiella, C. Peptostreptococcus, D. Pseudomonas
A: Bacteroides
Answer: A: Bacteroides 
Explanation: Ans. is 'a' i.e. Bacteroides