The following are multiple choice questions (with answers) about medical knowledge.   **Question:** 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
['(D) Necrotizing sialometaplasia <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Actinomycosis \n (B) Squamous cell carcinoma \n (C) Pleomorphic adenoma \n (D) Necrotizing sialometaplasia <> possible answers', '  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: <> context@']