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
Which of the following is a significant distinguishing feature of viral conjunctivitis? 
Select and explain. 
A. Significant eye pain, B. Globular purulent discharge, C. Clear discharge, D. Eye
C: Clear discharge
Answer: C: Clear discharge 
Explanation: Significant eye pain or decreased visual acuity is not consistent with the diagnosis of viral conjunctivitis. The hallmark of bacterial conjunctivitis is a continuous globular purulent discharge seen at the lid margins and in the corners of the eye. Viral conjunctivitis typically has a clear discharge with occasional scant mucoid discharge. Both may present with a history of the eye "matted shut" in the morning. Ref: Levsky M.E., DeFlorio P. (2010). Chapter 2. Ophthalmologic Conditions. In K.J. Knoop, L.B. Stack, A.B. Storrow, R.J. Thurman (Eds), The Atlas of Emergency Medicine, 3e.