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
The initial therapy of documented deep venous thrombosis in a post operative case is ? 
Select and explain. 
A. Subcutaneous heparin therapy, B. Intravenous heparin therapy, C. Thrombolytic therapy with urokinase, D. Aspirin therapy
B: Intravenous heparin therapy
Answer: B: Intravenous heparin therapy 
Explanation: Ans. is 'b' i.e., Intravenous heparin therapy