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
Complication of long-term hemophilia   a) Joint deformity  b) Transfusion transmitted disease  c) Renal calculi  d) Severe iron deficiency anemia 
Select and explain. 
A. ab, B. bc, C. bd, D. ad
A: ab
Answer: A: ab 
Explanation: None