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
Anemia with reticulocytosis is seen in - 
Select and explain. 
A. Hemolysis, B. Iron deficiency anemia, C. Vitamin B12 deficiency, D. Aplastic anemia
A: Hemolysis
Answer: A: Hemolysis 
Explanation: Ans. is 'a' i.e., Hemolysis Reticulocytosis (Increased RBC production)Reticulocytopenia (Decreased RBC production)CriteriaReticulocyte index > 3%Reticulocyte count > 1.5%CriteriaReticulocyte index < 1%Reticulocyte count < 0.5%Conditionso Acute blood loss or hemorrhageo Postsplenectomyo Microangiopathic anemiao Autoimmune hemolytic anemiao Hemoglobulinopathy (Sickle cell anemia and thalassemia)o Post anemia treatment like folatesupplementation, iron supplementation & vitamin B12, supplementationConditionso Aplastic anemiao Bone marrow infiltrationo Bone marrow suppression (Sepsis/chemotherapy radiotherapy)o Blood transfusiono Liver diseaseo Disordered RBC maturation (iron, B12, folate deficiency, hypothyroidism, sideroblastic anemia or anemia of chronic disease)