21056
Mr. John becomes the latest of many music stars , including George Michael and Whitney Houston , to appear in ads for the diet drink .
 John, George Michael, Whitney Houston
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 John, George Michael, Whitney Houston