This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which of the following is a quantitative defect in globin synthesis 
Select and explain. 
A. Thalassemia, B. Sickle cell hemoglobinopathy, C. G6PD deficiency, D. Diamond-Black fan syndrome
A: Thalassemia
Answer: A: Thalassemia 
Explanation: Ans. is 'a' i.e., Thalassemia