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On 21 December 2017 , he was appointed as the head coach of Ajax after the club dismissed Marcel Keizer .
 organization: Ajax; person: Marcel Keizer
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: Ajax, Marcel Keizer 
Answer:
 organization: Ajax; person: Marcel Keizer