Bone marrow failure causes pancytopenia:
a. In the peripheral blood only
b. In the bone marrow only
c. In both the bone marrow and the peripheral blood
d. In the bone marrow, peripheral blood, and spleen
ANS: C
Bone marrow failure results in a decrease in all the blood cells' elements in the bone marrow (hence it is called bone marrow failure). Because blood cells are not being produced in adequate numbers in the bone marrow to enter the peripheral blood, pancytopenia is also seen in the blood.
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