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Bob Hastings was the host for the first few weeks ; afterwards , Jack Clark , who was better known at the time as an announcer for other game shows , took over as the host .
 person: Bob Hastings; person: Jack Clark
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: Bob Hastings, Jack Clark 
Answer:
 person: Bob Hastings; person: Jack Clark