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
The organism most commonly causing membranous conjunctivitis is: 
Select and explain. 
A. Moraxella, B. Gonococcus, C. Streptococcus, D. Corynebacterium diphtheria
D: Corynebacterium diphtheria
Answer: D: Corynebacterium diphtheria 
Explanation: Corynebacterium diphtheria