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: Unknown
[{'content': 'Organism commonly associated with wearing of soft lens: \nSelect and explain. \nA. Acanthamoeba, B. Aspergillus, C. Staphylococcus aureus, D. Psedomonas aeruginosa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: refer : AK KHURANA COMPREHENSIVE OPHTHALMOLOGY 6TH EDITION pg 100\nMode of infection of Acanthamoeba\n\nContact lens wearers using home-made saline (from contaminated tap water and saline tablets)\n\tis the commonest situation recognised for acanthamoeba infection in western countries.\nOther situations include mild trauma associated with contaminated vegetable matter, salt water\n\tdiving, wind blown contaminant and hot tub use. Trauma with organic matter and exposure to muddy water are the major predisposing factors in developing countries.\nOpportunistic infection. Acanthamoeba keratitis can also occur as opportunistic infection in patients with herpetic keratitis, bacterial keratitis, bullous keratopathy and neuroparalytic keratitis.', 'role': 'assistant'}]