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 colloid solutions has proven thromboprophylactic (antithrombotic) effect - 
Select and explain. 
A. Gelatin, B. Dextron 40, C. Dextron 100, D. Hetastarch
B: Dextron 40
Answer: B: Dextron 40 
Explanation: Ans. is 'b' i.e., Dextran 40 o Dextran 40 and 70 interferes with coagulation and platelet function and thus prolong bleeding time and so is not used in hypofibrinogenemia, thrombocytopenia or in presence of bleeding. o Dextran 40 has been tried in stroke, in DVT prophylaxis and pulmonary infarction.