<prompt> Intravenous immunoglobulin therapy is effective in some patients with which of the conditions?Pure red cell aplasiaMyelodysplasiaPNHG6PD deficiency  <response>: Red cell aplasia is treated with combination of erythrocyte transfusions and iron chelation. For persistent B19 parvovirus infection, almost all patients respond to intravenous immunoglobulin therapy. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 895 