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: Surgery
All are done for a case of deep vein thrombosis except- 
Select and explain. 
A. Thrombolytic therapy, B. Bandage, C. Heparin, D. Bed rest
D: Bed rest
Answer: D: Bed rest 
Explanation: Immobilization is a risk factor for DVT.