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: Medicine
[{'content': 'About Pneumocystis pneumonia the true statement is: \nSelect and explain. \nA. The causative organism is a protozoan, B. Drug of choice is Trimethoprim-Sulfamethoxazole (Cotrimoxazole), C. Most common radiological appearance is a bat wing distribution of infiltrates with pneumocysts in peripheral fields, D. Steroids have no role in the therapy of Pneumocystis pneumonia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pneumocystis jirovecii is a fungus responding to Cotrimoxazole. It causes opportunistic pneumonia in patients with HIV infection.\xa0\nThe most common radiology finding is a normal X-ray chest.\xa0 However, the most typical X-ray is\xa0 a bat wing distribution of infiltrates with pneumocysts in peripheral fields.\xa0\nSteroids are combined with Cotrimoxazole in treatment of severe Pneumocystis jirovecii pneumonia.', 'role': 'assistant'}]