The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Direction of placement of retentive pin holes should be:   (A) Perpendicular to external tooth surface   (B) Parallel to external tooth surface   (C) Parallel to other pins   (D) Never beneath cusps to be restored
['(B) Parallel to external tooth surface <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Perpendicular to external tooth surface \n (B) Parallel to external tooth surface \n (C) Parallel to other pins \n (D) Never beneath cusps to be restored <> possible answers', '  Direction of placement of retentive pin holes should be: <> context@']