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
Most common organism cultured in CSOM is 
Select and explain. 
A. Staphylococcus aureus, B. Staphylococcus epidermidis, C. Staphylococcus pneumonia, D. Pseudomonas aeruginosa
D: Pseudomonas aeruginosa
Answer: D: Pseudomonas aeruginosa 
Explanation: 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)