This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
Which organism does not invade intact cornea? 
Select and explain. 
A. Pseudomonas, B. N. meningitidis, C. N. gonorrhoea, D. C. diphtherias
A: Pseudomonas
Answer: A: Pseudomonas 
Explanation: Ans. (a) PseudomonasRef: Yanoff 4/e, p. 217Although disruption of the continuity of the epithelium is the most common event that allows the establishment of a corneal infection, a few organisms such as Corynebacterium diphtheria, jaemophilus aegypticus, Neisseria gonorrhoeae, Neisseria meningitides and Shigella and Listeria species can penetrate an intact epithelium.