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Guo Yuanzhen ( 郭元振 ; 656 – 713 ) , formal name Guo Zhen ( 郭震 ) but went by the courtesy name of Yuanzhen , was an official , general , and diplomat of the Chinese dynasty Tang Dynasty and Wu Zetian 's Zhou Dynasty , serving as a chancellor during the reigns of Emperor Ruizong and Emperor Xuanzong .
 Guo Yuanzhen, Guo, Yuanzhen, Wu Zetian, Emperor Ruizong, Emperor Xuanzong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Guo Yuanzhen, Guo, Yuanzhen, Wu Zetian, Emperor Ruizong, Emperor Xuanzong