7240
In Sendai a - per-day refinery owned by the largest refiner in  Japan  JX  Nippon Oil  Energy was also set ablaze by the quake .
 country of headquarters: Japan, Nippon Oil
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Japan, Nippon Oil 
Answer:
 country of headquarters: Japan, Nippon Oil