The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 58-year-old white man with hypertension and type 2 diabetes mellitus comes to the physician because of a 3-month history of a painless lesion on his lower lip. He has smoked one pack of cigarettes daily for 20 years. He has worked as a fruit picker for the past 25 years. His current medications include captopril and metformin. Examination of the oral cavity shows a single ulcer near the vermillion border. Which of the following is the most likely diagnosis?   (A) Squamous cell carcinoma   (B) Aphthous stomatitis   (C) Actinic keratosis   (D) Traumatic ulcer
['(A) Squamous cell carcinoma <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Squamous cell carcinoma \n (B) Aphthous stomatitis \n (C) Actinic keratosis \n (D) Traumatic ulcer <> possible answers', '  A 58-year-old white man with hypertension and type 2 diabetes mellitus comes to the physician because of a 3-month history of a painless lesion on his lower lip. He has smoked one pack of cigarettes daily for 20 years. He has worked as a fruit picker for the past 25 years. His current medications include captopril and metformin. Examination of the oral cavity shows a single ulcer near the vermillion border. Which of the following is the most likely diagnosis? <> context@']