Identify the statement that best explains how azathioprine (Imuran) works to treat lupus erythematosus.
A. Azathioprine causes B-cell production of antibodies and increases the production of killer T-cells.
B. Azathioprine prevents the production of adenine and guanine, which leads to the suppression of existing lymphocytes and suppresses the formation of new B-cells and T-cells.
C. Azathioprine stimulates the bone marrow to increase the production of macrophages and granulocytes.
D. None of these are correct
Answer: B
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