The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Amalgam restorations give the best clinical service when the residual mercury content is:   (A) 38-42%   (B) 48-52%   (C) 58-62%   (D) 68-72%
['(B) 48-52% <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 38-42% \n (B) 48-52% \n (C) 58-62% \n (D) 68-72% <> possible answers', '  Amalgam restorations give the best clinical service when the residual mercury content is: <> context@']