17823
In the early 1950 s , the DuMont Television Network began the modern practice of selling advertisement time to multiple sponsors .
 organization: DuMont Television Network
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: DuMont Television Network 
Answer:
 organization: DuMont Television Network