This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'The most common oppounistic infection observed in patients with AIDS is - \nSelect and explain. \nA. Atypical mycobacteria, B. Haemophilus influenzae, C. Pseudomonas aerugiosa, D. Pneumocystis carinii', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The symptoms of PCP include Fever Cough Difficulty breathing Chest pain Chills Fatigue (tiredness) In people with HIV/AIDS, PCP symptoms usually develop over several weeks and include a mild fever. In people who have weakened immune systems for reasons other than HIV/AIDS, PCP symptoms usually develop over a few days, often with a high fever. Ref Harrison20th edition pg 1078', 'role': 'assistant'}]