69407
For presidents Ronald Reagan , Bill Clinton , George W. Bush and Barack Obama , for example , their respective paths to nomination became uneventful and the races become merely " pro forma " ; all four then went on to win a second presidential term .
 person: Ronald Reagan; person: Bill Clinton; person: George W. Bush; person: Barack Obama
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: Ronald Reagan, Bill Clinton, George W. Bush, Barack Obama 
Answer:
 person: Ronald Reagan; person: Bill Clinton; person: George W. Bush; person: Barack Obama