This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid & Electrolyte, Subject name: Surgery
Which of the following is not used for intravascular volume maintenance is: 
Select and explain. 
A. Hydroxy ethyl starch, B. Dextran, C. Erythropoetin, D. Gelatin
C: Erythropoetin
Answer: C: Erythropoetin 
Explanation: Ans. (c) ErythropoetinRef: Crystalloids versus colloids in fluid resuscitation: a systematic review. Crit Care Med.* Colloids increase intravascular volume* Colloids are dextran, gelatin, hydroxyethyl starch.