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The first cryoprotectant solutions able to vitrify at very slow cooling rates while still being compatible with whole organ survival were developed in the late 1990 s by cryobiologists Gregory Fahy and Brian Wowk for the purpose of banking transplantable organs .
 person: Gregory Fahy; person: Brian Wowk
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Gregory Fahy, Brian Wowk 
Answer:
 person: Gregory Fahy; person: Brian Wowk