250522
Playing career Club career Polak began his National Soccer League career with Sydney Olympic in 1989 after having spent three years at the Australian Institute of Sport .
 Polak, Sydney Olympic, Australian Institute of Sport
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Polak, Sydney Olympic, Australian Institute of Sport