The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The enamel has no capacity of self —repair because   (A) It has only a small percent of organic content   (B) Its formative cells are lost once it is completely formed   (C) It is essentially a keratin tissue and has no blood vessels   (D) It has no direct connection with the active cells of the dental pulp
['(B) Its formative cells are lost once it is completely formed <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) It has only a small percent of organic content \n (B) Its formative cells are lost once it is completely formed \n (C) It is essentially a keratin tissue and has no blood vessels \n (D) It has no direct connection with the active cells of the dental pulp <> possible answers', '  The enamel has no capacity of self —repair because <> context@']