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
[{'content': 'Most common organism found in acute sinusitis: \nSelect and explain. \nA. Streptococcus pneumoniae., B. Hemophilus influenzae., C. Moraxella catarrhalis, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pathophysiology of maxillary sinus:\nMost common organisms found in acute sinusitis are streptococcus pneumonia, Hemophilus influenzae, Moraxella catarrhalis. In approx 8-10% cases of acute sinusitis, Bacteroid spp and staphylococcus aureus are causative organisms. Organisms that are commonly associated with chronic sinusitis are anaerobic bacteria, such as bacteroids spp, fusobacterium, Streptococci, Veilonella and corynebacterium spp.', 'role': 'assistant'}]