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He challenged seven other swimmers on the second heat , including Olympic veterans Derya Büyükuncu of Turkey and Nicholas Neckles of Barbados .
 person: Derya Büyükuncu; person: Nicholas Neckles
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Derya Büyükuncu, Nicholas Neckles 
Answer:
 person: Derya Büyükuncu; person: Nicholas Neckles