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All three main candidates of the election - Moon Jae-in , Ahn Cheol-soo , and Hong Joon-pyo - promised to take measure to alleviate the growing national air pollution problems .
 Moon Jae-in, Ahn Cheol-soo, Hong Joon-pyo
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:
 Moon Jae-in, Ahn Cheol-soo, Hong Joon-pyo