What is the relationship between 'Phosagro' and 'MOSCOW' in the context of the input sentence.
Options: headquarters location, platform, director/manager, owned by

MOSCOW Aug 3 Russian fertiliser producer Phosagro said on Monday that its agent Citigroup Global Markets Deutschland had reopened a facility that allows conversions between Phosagro's global depositary receipts (GDRs) and ordinary shares.
headquarters location