This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hemolytic anemia, Subject name: Pathology
[{'content': 'All cause Reticulocytosis EXCEPT: \nSelect and explain. \nA. Aplastic anemia, B. Thalassemia, C. Sickle cell anemia, D. Chronic blood loss', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Aplastic anemiaRef: Robbiris pathology 9th ed. /631* Aplastic anemia is characterized by destruction of bone marrow and thereby reduction in pluri-potent stem cells and their progeny.Henceforth the production of reticulocytes is less.* Thalassemia and sickle cells are hemolytic anemias having extra-vascular hemolysis and thereby reticulocytosis.* In chronic blood loss the loss of RBC provoke the bone marrow to be more aggressive and release reticulocytes in circulation.* REMEMBER: Reticulocytopenia may be a result of viral Parvovirus B19 infection, which invades and destroys red blood cell precursors and halts the red cell production.', 'role': 'assistant'}]