5748
On June 28 , 1991 , he was signed as a free agent by the Chicago Cubs to a minor league contract .
 Chicago Cubs
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:
 Chicago Cubs