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': 'Oppurtunistic infection are seen in: \nSelect and explain. \nA. AIDS, B. Autoimmune diseases, C. Organ transplantation, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ansr d (All)There is no doubt that AIDS and organ transplantation cause opportunistic infectionNotes: Commonest parasitic infection seen in AIDS is strongyloides stercolaris.', 'role': 'assistant'}]