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 . 
 country capital: Saudi Arabia, Riyadh
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: 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:
 country capital: Saudi Arabia, Riyadh