The following are multiple choice questions (with answers) about medical knowledge.   **Question:** MTA barrier in open apex is made up to?   (A) 3mm   (B) 5mm   (C) Depend on length of canal   (D) 1mm
['(B) 5mm <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 3mm \n (B) 5mm \n (C) Depend on length of canal \n (D) 1mm <> possible answers', '  MTA barrier in open apex is made up to? <> context@']