**Question:** All of the following are true of thalassemia major, EXCEPT:

A. Thalassemia major is a hereditary disorder caused by mutations in hemoglobin synthesis genes.
B. Patients with thalassemia major require regular blood transfusions to maintain hemoglobin levels.
C. Thalassemia major is associated with iron overload and requires chelation therapy to prevent complications.
D. Thalassemia major patients typically have normal life expectancy without proper management.

**Correct Answer:** D. Thalassemia major patients typically have normal life expectancy without proper management.

**Core Concept:**
Thalassemia major is a severe form of hemoglobinopathy caused by defects in hemoglobin synthesis genes, leading to reduced or absent hemoglobin production. Hemoglobin is a protein found in red blood cells that carries oxygen from the lungs to the body's tissues. In thalassemia major, the affected individuals have a reduced life expectancy due to severe anemia, organ dysfunction, and complications associated with the disease.

**Why the Correct Answer is Right:**
Thalassemia major patients require regular blood transfusions to maintain hemoglobin levels and alleviate the symptoms of severe anemia. These transfusions, while essential for survival, can lead to iron overload in various organs, particularly the liver, heart, and endocrine glands. Iron overload can cause organ dysfunction, thereby reducing the overall life expectancy of thalassemia major patients.

**Why Each Wrong Option is Incorrect:**
A. Thalassemia major is a hereditary disorder caused by mutations in hemoglobin synthesis genes, which is true.
B. Patients with thalassemia major require regular blood transfusions to maintain hemoglobin levels, but it is not because they have a normal life expectancy.
C. Thalassemia major patients are at risk for iron overload and require chelation therapy to prevent organ dysfunction and improve life expectancy, which is true.
D. Thalassemia major patients typically have normal life expectancy without proper management. This is incorrect because proper management includes regular transfusions, iron chelation therapy, and close monitoring to prevent complications. Without these measures, life expectancy is significantly reduced.

**Clinical Pearl:**
The management of thalassemia major involves a comprehensive approach that includes regular blood transfusions, iron chelation therapy, and careful monitoring of organ function and complications. Proper management can significantly improve the life expectancy of these patients. On the other hand, neglecting management can lead to iron overload, organ dysfunction, and a reduced life expectancy.