The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is a dye used for dentinal caries detection:   (A) Calcein   (B) Zygo ZL-22.   (C) Fuschin.   (D) Acid red system.
['(D) Acid red system. <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Calcein \n (B) Zygo ZL-22. \n (C) Fuschin. \n (D) Acid red system. <> possible answers', '  Which of the following is a dye used for dentinal caries detection: <> context@']