541
The show ranked number 7 in the 1949 Nielsen ratings , number 9 in the 1950 - 1951 season and number 28 in 1951 - 1952 .
 organization: Nielsen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Nielsen