The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Dentin island are frequently found in the root canals of which of the following permanent teeth   (A) Upper 2nd Molar   (B) Upper 2nd Premolar   (C) Lower 2nd Molar   (D) Lower 2nd Premolar
['(B) Upper 2nd Premolar <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Upper 2nd Molar \n (B) Upper 2nd Premolar \n (C) Lower 2nd Molar \n (D) Lower 2nd Premolar <> possible answers', '  Dentin island are frequently found in the root canals of which of the following permanent teeth <> context@']