This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
Which of the following has proved antithrombotic 
Select and explain. 
A. Gelatin, B. Dextran 40, C. Dextran 100, D. Hetastarch
B: Dextran 40
Answer: B: Dextran 40 
Explanation: refer KDT 6/e p622 Dextran 40 and 70 interferes with coagulation and platelet function and thus prolong bleeding time and so is not used in hyperfibrinogenic ,thrombocytopenia or in presence of bleeding