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In 1941 Reza Khan was forced , by the invading British , to abdicate in favor of his son Mohammad Reza Pahlavi who replaced his father as Shah on the throne on September 16 , 1941 .
 Reza Khan, Mohammad Reza Pahlavi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Reza Khan, Mohammad Reza Pahlavi