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William Patrick Sandifer ( born January 5 , 1952 in Quantico , Virginia ) is a former professional American football player who played defensive lineman for five seasons for the San Francisco 49ers and Seattle Seahawks .
 Sandifer, Quantico , Virginia, San Francisco 49ers, Seattle Seahawks
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sandifer, Quantico , Virginia, San Francisco 49ers, Seattle Seahawks