16571
There are 210 Nielsen DMAs in the United States , 70 of which are metered ( in other words , viewership in these markets are estimated automatically instead of through the archaic diary system still in use in the smaller markets ) .
 location: United States
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: United States 
Answer:
 location: United States