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': 'An organism not invading intact cornea- \nSelect and explain. \nA. Gonococci, B. C. diphtheriae, C. Meningococci, D. Pseudomonas', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Following three pathogens can invade the intact corneal epithelium and produce ulceration:\n\nNeisseria gonorrhoea,\ncorynebacterium diphtheriae and \nNeisseria meningitidis.', 'role': 'assistant'}]