The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A pier abutment is:   (A) Periodontally weak abutment   (B) With an edentulous space on mesial and distal sides of the abutment   (C) Edentulous space on one side of the abutment   (D) Abutment adjacent to edentulous space
['(B) With an edentulous space on mesial and distal sides of the abutment <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Periodontally weak abutment \n (B) With an edentulous space on mesial and distal sides of the abutment \n (C) Edentulous space on one side of the abutment \n (D) Abutment adjacent to edentulous space <> possible answers', '  A pier abutment is: <> context@']