This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Most common organism cultured in CSOM is \nSelect and explain. \nA. Staphylococcus aureus, B. Staphylococcus epidermidis, C. Staphylococcus pneumonia, D. Pseudomonas aeruginosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pus culture in both aerobic and anaerobic CSOM may show multiple organisms. Common aerobic organisms are Pseudomonas aeruginosa Proteus Escherichia coli Staphylococccus aureus While anaerobes include Bacteroides fragilis Anaerobic streptococcal (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 76)', 'role': 'assistant'}]