This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Cornea, Subject name: Ophthalmology
[{'content': 'Patient came to the OPD with recent onset photphobia within 24 hours and sloughing corneal ulcer. There is greenish ulcer base. Which of the following can be the causative organism: \nSelect and explain. \nA. Acanthamoeba, B. Nocardia, C. Pseudomonas, D. Herpes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pseudomonas Ulcer Rapid onset & Greenish ulcer base Produce biofilm that cause resistance MC cause of infection in contact lens users Nocardia ulcer resembles fungal ulcer in its characteristics.', 'role': 'assistant'}]