Answer to Question 1
ANS: C
O-negative blood is referred to as the universal donor blood and may be given to a patient until the blood is typed and crossmatched or until compatible blood can be obtained.
Answer to Question 2
ANS: D
Abnormal blood cells produced by the bone marrow, bleeding, dietary deficiency, diseases, drugs, overactive reticuloendothelial system in the spleen or liver, or incompatible blood transfusion can cause anemia.