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Six Prime Ministers ( William Fox , Henry Sewell , Edward Stafford , George Grey , Joseph Ward and Jacinda Ardern ) have won by-elections later in their parliamentary careers , while Labour leaders Harry Holland and David Shearer were also first elected via a by-election .
 person: William Fox; person: Henry Sewell; person: Edward Stafford; person: George Grey; person: Joseph Ward; person: Jacinda Ardern; organization: Labour; person: Harry Holland; person: David Shearer
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: William Fox, Henry Sewell, Edward Stafford, George Grey, Joseph Ward, Jacinda Ardern, Labour, Harry Holland, David Shearer 
Answer:
 person: William Fox; person: Henry Sewell; person: Edward Stafford; person: George Grey; person: Joseph Ward; person: Jacinda Ardern; organization: Labour; person: Harry Holland; person: David Shearer