The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Serum is:   (A) Plasma-clotting factors   (B) Plasma-fibrin   (C) Blood-RBC   (D) Blood-all cellular elements
['(B) Plasma-fibrin <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Plasma-clotting factors \n (B) Plasma-fibrin \n (C) Blood-RBC \n (D) Blood-all cellular elements <> possible answers', '  Serum is: <> context@']