9239
Developmental history In the 1970s , while helping to co-develop Dungeons and Dragons , Gary Gygax created a campaign setting which eventually became known as the World of Greyhawk .
 person: Gary Gygax
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:
 person: Gary Gygax