257159
They usually arise in the cerebellum , near the brainstem , hypothalamic region , or the optic chiasm , but they may occur in any area where astrocyte s are present , including the cerebral hemispheres and the spinal cord .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None