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
All the following cause extra vascular hemolysis except? 
Select and explain. 
A. Hereditary spherocylosis, B. Thalassemia, C. Autoimmune hemolytic anemia, D. Blood transfusion reaction
D: Blood transfusion reaction
Answer: D: Blood transfusion reaction 
Explanation: Blood transfusion reaction cause intravascular hemolysis.