1710
On December 20 , 2011 , he signed a minor league contract that included an invitation to spring training with the Washington Nationals .
 organization: Washington Nationals
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Washington Nationals 
Answer:
 organization: Washington Nationals