The following are multiple choice questions (with answers) about medical knowledge.   **Question:** For an unbounded amalgam restoration, what should be done before copal varnish is applied ?   (A) Dentine desensitiser is applied   (B) Smear layer is left intact   (C) Smear layer is modified   (D) After removal of enamel smear layer only
['(A) Dentine desensitiser is applied <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Dentine desensitiser is applied \n (B) Smear layer is left intact \n (C) Smear layer is modified \n (D) After removal of enamel smear layer only <> possible answers', '  For an unbounded amalgam restoration, what should be done before copal varnish is applied ? <> context@']