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In his farewell speech from the office of president in January 2017 Barack Obama jokingly quipped , " You can tell that I 'm a lame duck because nobody 's following instructions " when the cheering and applause from the crowd prevented him from commencing his speech .
 Barack Obama
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:
 Barack Obama