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: Pharmacology
Which of the following has proved antithrombotic property : 
Select and explain. 
A. Gelatin, B. Dextran 40, C. Dextran 100, D. Hexastarch
B: Dextran 40
Answer: B: Dextran 40 
Explanation: None