<prompt> Which of the following is not a type of hypoproliferative anemia?Anemia caused by Parvovirus B19 infectionAnemia of chronic diseaseinflammationFanconi anemiaG6PD deficiency  <response>: Anemias can be classified into 3 broad categories based on the underlying mechanism: Hemorrhagic - AcuteChronic blood loss HyperproliferativeHemolytic increased red cell destruction Red cell membrane disorders - Hereditary spherocytosis, etc. Enzyme deficiencies - G6PD, pyruvate kinase, etc. Hemoglobinopathies - Thalassemias, sickle cell anemia, etc. Autoimmune hemolytic anemia Hypoproliferative decreased red cell production Inherited bone marrow failure - Fanconi anemia, telomerase defects Nutritional deficiencies - Iron, vitamin B12, folate, etc. Erythropoietic deficiency - Renal failure, anemia of chronic inflammation Inflammation-mediated iron sequestration - Anemia of chronic inflammation Infection of red cell progenitors - Parvovirus B19 infection 