11521
 OPEC 's acting secretary general , Mohammed Barkindo , who is also a senior Nigerian official , told the energy publication Platts that he had met with Saudi Arabia 's oil minister this week in Riyadh and that Saudi Arabia was already cutting its production as part of the informal agreement . 
 Saudi Arabia, Riyadh
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 Saudi Arabia, Riyadh