The following are multiple choice questions (with answers) about medical knowledge.   **Question:** According to scientists, recent studies says about the pattern of enamel prism demineralization, true is:   (A) Head and tail both are resistant to dissolution   (B) Head and tail both are not resistant to dissolution   (C) Head is more resistant to dissolution   (D) Tail is more resistant to dissolution
['(D) Tail is more resistant to dissolution <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Head and tail both are resistant to dissolution \n (B) Head and tail both are not resistant to dissolution \n (C) Head is more resistant to dissolution \n (D) Tail is more resistant to dissolution <> possible answers', '  According to scientists, recent studies says about the pattern of enamel prism demineralization, true is: <> context@']