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: Ophthalmology
[{'content': 'A soft contact lens users have corneal keratitis cause is – \nSelect and explain. \nA. Acanthamoeba – ulcer, B. Erosion of cornea, C. Pseudomonas infection, D. Herpes infection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "Pseudomonas aeruginosa is the most common organism encountered in contact lens-related acute keratitis and\xa0corneal ulcer".\n-Holland & Mannis\nAcanthamoeba is the 2nd most common cause.', 'role': 'assistant'}]