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
Normal conjunctival flora is- 
Select and explain. 
A. E coli, B. Pseudomonas, C. Coagulase negative staphylococci, D. lactobacillus
C: Coagulase negative staphylococci
Answer: C: Coagulase negative staphylococci 
Explanation: 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