37131
The 1919 – 20 Northern Rugby Football Union season was the twenty fifth season of rugby league football .
 organization: Northern Rugby Football Union
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: Northern Rugby Football Union 
Answer:
 organization: Northern Rugby Football Union