This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
[{'content': 'Normal conjunctival flora is- \nSelect and explain. \nA. E coli, B. Pseudomonas, C. Coagulase negative staphylococci, D. lactobacillus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Staphylococcus epidermidis is an innocuous flora of lid and conjunctiva. It can also produce blepharo conjunctivitis Staphylococcus aureus is the most common cause of bacterial conjunctivitis and blepharoconjunctivitis. Ref: A K KHURANA COMPREHENSIVE OPHTALMOLOGY,E4,page-55', 'role': 'assistant'}]