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
[{'content': 'Most common organism causing appendicitis is? \nSelect and explain. \nA. Bacteroids, B. E. coli, C. Staphylococcus, D. Streptococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]