63787
He mocked controversial NBC president Fred Silverman as " a total unequivocal failure " and displayed a chart showing the poor ratings of NBC programs .
 NBC, Fred Silverman, NBC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 NBC, Fred Silverman, NBC