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Its foundation stone was laid by President William Howard Taft , when he was joined by Senator Robert M. La Follette and Congressman John J. Esch .
 person: William Howard Taft; person: Robert M. La Follette; person: John J. Esch
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 Howard Taft, Robert M. La Follette, John J. Esch 
Answer:
 person: William Howard Taft; person: Robert M. La Follette; person: John J. Esch