The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A patient notices a well demarcated area of depapillation on his tongue which has been there for as long as he can remember. The most probable diagnosis:   (A) Median rhomboid glossitis   (B) Geographic tongue   (C) Black hairy tongue   (D) Moeller's glossitis
['(A) Median rhomboid glossitis <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', "(A) Median rhomboid glossitis \n (B) Geographic tongue \n (C) Black hairy tongue \n (D) Moeller's glossitis <> possible answers", '  A patient notices a well demarcated area of depapillation on his tongue which has been there for as long as he can remember. The most probable diagnosis: <> context@']