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A 67 year old woman has a chronic sore mouth of 2 years duration. The lesions consist of multiple persistent ulcers adjacent to white rough thickened areas which do not rub off and are arranged in a striated pattern. The lesions are bilateral and involve the buccal mucosa, lateral borders of the tongue, and gingiva. Of the following, the best diagnosis is _______________.A. epidermolysis bullosaB. pemphigusC. herpanginaD. lichen planusE. recurrent herpes