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Both left the group shortly after the album 's release and were replaced by Grace Slick and Spencer Dryden , respectively .
 person: Grace Slick; person: Spencer Dryden
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: Grace Slick, Spencer Dryden 
Answer:
 person: Grace Slick; person: Spencer Dryden