63036
The program ended in 2016 when the last eligible president , Ronald Reagan , was commemorated ( George H. W. Bush was still alive at the time ) .
 Ronald Reagan, George H. W. Bush
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ronald Reagan, George H. W. Bush