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 organism causing appendicitis is? 
Select and explain. 
A. Bacteroids, B. E. coli, C. Staphylococcus, D. Streptococcus
A: Bacteroids
Answer: A: Bacteroids 
Explanation: Bacteroids are the common organism causing appendicitis. While appendicitis is clearly associated with bacterial proliferation within the appendix, no single organism is responsible. A mixed growth of aerobic and anaerobic organisms is usual. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1206