Task: Text Categorization
Input (English): Question: Point out the correct answer regarding the regulation of hematopoiesis: 
 Options:  <0> Altitude inhibits hematopoiesis. <1> Erythropoietin inhibits hematopoiesis. <2> Hypoxia stimulates the production of erythropoietin. <3> Erythropoietin is synthesized in the liver. <4> Erythropoietin does not influence the production of red blood cells.
Output (English): nursery