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She won the silver medal in the 1500 metres at the 2008 World Junior Championships and won another junior silver at the 2009 African Junior Athletics Championships , finishing behind Caster Semenya .
 Caster Semenya
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caster Semenya