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A 24-year-old female patient is seen at your office and reports that her eyes have been red for a few days. Biomicroscopy reveals bilateral diffuse superficial punctate keratitis (SPK) that stains with sodium fluorescein with no mucopurulent discharge. Based ONLY upon the corneal staining pattern, what is the MOST likely origin of her condition?
A. Dry eyes
B. Bacterial
C. Foreign body
D. Viral