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': 'Hydroxyethyl starch is used as: \nSelect and explain. \nA. Plasma expander, B. Inotropic agent, C. Vasodilator, D. Type of dextran', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is a blood volume expander used in treatment of hypovolemia; adjunct in leukapheresis to improve harvesting and increase the yield of granulocytes by centrifugation. Mechanism of Action: Produces plasma volume expansion by viue of its highly colloidal starch structure. Onset of action: Volume expansion: I.V.: Approximately 30 minutes. Contraindications: Renal failure with oliguria or anuria (not related to hypovolemia); any fluid overload condition (eg, pulmonary edema, congestive hea failure); pre-existing coagulation or bleeding disorders. Ref: Wang S. (2012). Chapter 116. Paracentesis. In G.V. Lawry, S.C. McKean, J. Matloff, J.J. Ross, D.D. Dressler, D.J. Brotman, J.S. Ginsberg (Eds), Principles and Practice of Hospital Medicine.', 'role': 'assistant'}]