153781
After a stint at NASA , he returned to help attract in 1981 the Space Telescope Science Institute to JHU , an organization that now employs 500 , including 100 PhDs .
 organization: Space Telescope Science Institute
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: Space Telescope Science Institute 
Answer:
 organization: Space Telescope Science Institute