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South African scientists were the first to question the President ' s meddling in a scientific debate , which they contended , was already over .
 South African, South African scientists, the President, they
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 South African, South African scientists, the President, they