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: Pathology
Which of the following blood disease has a racial predilection? 
Select and explain. 
A. Purpura, B. Hemophilia, C. Polycythemia, D. Thalassemia
D: Thalassemia
Answer: D: Thalassemia 
Explanation: None