A 64-year-old man presented to the oral medicine clinic with a painful, smooth, red tongue, and a burning sensation around his lips that had developed 6 months earlier. No deficits were found on neurologic examination.
What is the most likely diagnosis?
A) Oral lichen planus
B) Sjögren's syndrome
C) Squamous-cell carcinoma of the tongue
D) Pernicious anemia
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