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
[{'content': 'Dextran is a good plasma expanders, but disadvantage of : \nSelect and explain. \nA. Interference with blood group matching, B. Causes thrombocytopenia, C. Decreases microcirculation, D. Promote roleaux formation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]