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In 1975 , Colin Groves and Vratislav Mazák announced a new species of human they called " Homo ergaster " .
 person: Colin Groves; person: Vratislav Mazák
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: Colin Groves, Vratislav Mazák 
Answer:
 person: Colin Groves; person: Vratislav Mazák