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': 'The organism most commonly causing membranous conjunctivitis is: \nSelect and explain. \nA. Moraxella, B. Gonococcus, C. Streptococcus, D. Corynebacterium diphtheria', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Corynebacterium diphtheria', 'role': 'assistant'}]