A painful crater like 1.5 cm ulcer develops within one week on the hard palate mucosa of a 40 year old female The most likely diagnosis is_______________?

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A painful crater like 1.5 cm ulcer develops within one week on the hard palate mucosa of a 40 year old female The most likely diagnosis is_______________?

A. Actinomycosis
B. Squamous cell carcinoma
C. Pleomorphic adenoma
D. Necrotizing sialometaplasia