**Core Concept**
Thalassemia major, also known as beta-thalassemia major or Cooley's anemia, is a severe form of thalassemia characterized by significant reductions in the production of the beta-globin chains of hemoglobin, leading to severe anemia, bone deformities, and other complications. It is a genetic disorder inherited in an autosomal recessive manner.

**Why the Correct Answer is Right**
Thalassemia major results from mutations in the HBB gene encoding the beta-globin subunit of hemoglobin. The disease is characterized by ineffective erythropoiesis, leading to a shortage of red blood cells and a compensatory increase in erythropoietin production. Bone deformities are caused by marrow expansion, which leads to bone resorption and osteoporosis. Regular blood transfusions are necessary to manage the disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Thalassemia major is a genetic disorder that can be managed with regular blood transfusions, but it is not a curable condition. This statement is true.
**Option B:** Beta-thalassemia major is caused by mutations in the HBB gene, which encodes the beta-globin subunit of hemoglobin. This statement is true.
**Option C:** Thalassemia major is characterized by severe anemia, bone deformities, and other complications. This statement is true.

**Clinical Pearl / High-Yield Fact**
The management of thalassemia major involves regular blood transfusions, iron chelation therapy, and bone marrow transplantation in selected cases. It is essential to monitor iron levels and ferritin levels closely to prevent iron overload, which can lead to serious complications.

**Correct Answer:** A.