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He went on to serve as a noted member of the cabinets of four Prime Ministers : William Lyon Mackenzie King , Louis St. Laurent , Lester B. Pearson and Pierre Trudeau .
 person: William Lyon Mackenzie King; person: Louis St. Laurent; person: Lester B. Pearson; person: Pierre Trudeau
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 Lyon Mackenzie King, Louis St. Laurent, Lester B. Pearson, Pierre Trudeau 
Answer:
 person: William Lyon Mackenzie King; person: Louis St. Laurent; person: Lester B. Pearson; person: Pierre Trudeau