41921
Sjödin is also an accomplished submission grappler , having won a gold medal in Ground Control 's 2010 no-gi tournament and silver medals in Grapplers Quest 's advanced division and North American Grappling Association 's ( NAGA ) European Championships that same year .
 Grapplers Quest, North American Grappling Association
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grapplers Quest, North American Grappling Association