Which of the following causes hemolytic anemia -a) Hereditary spherocytosisb) Infectionc) Iron deficiencyd) Sickle cell anemiae) Copper deficiency
**Core Concept**
Hemolytic anemia is a condition characterized by the premature destruction of red blood cells (RBCs) due to various factors, including inherited disorders, infections, and deficiencies of essential nutrients.
**Why the Correct Answer is Right**
Hereditary spherocytosis is a genetic disorder caused by mutations in genes encoding proteins essential for the formation and maintenance of the RBC membrane. This leads to the production of abnormally shaped RBCs, known as spherocytes, which are more prone to destruction in the spleen. The resulting hemolytic anemia is a hallmark of this condition.
**Why Each Wrong Option is Incorrect**
**Option A:** Hereditary spherocytosis is the correct answer, so this option is intentionally skipped.
**Option B:** Infections, such as malaria, can cause hemolytic anemia by damaging RBCs, but this is not the correct answer in this context.
**Option C:** Iron deficiency leads to anemia of chronic disease or iron-deficiency anemia, which is characterized by a decrease in RBC production, not hemolysis.
**Option D:** Sickle cell anemia is a genetic disorder that leads to hemoglobinopathies and vaso-occlusive crises, but it primarily causes hemolytic anemia due to the abnormal shape of RBCs, similar to hereditary spherocytosis. However, it's not the best choice here as the question is asking for a choice that causes hemolytic anemia, and hereditary spherocytosis is more specific to this type of anemia.
**Clinical Pearl / High-Yield Fact**
Hereditary spherocytosis is an autosomal dominant disorder, meaning a single copy of the mutated gene is sufficient to cause the condition. It's essential to consider this in the differential diagnosis of patients presenting with hemolytic anemia.
**Correct Answer: D. Sickle cell anemia**