Given phrases that describe the relationship between two words/phrases as options, extract the word/phrase pair and the corresponding lexical relationship between them from the input text. The output format should be "relation1: word1, word2; relation2: word3, word4". Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

LONDON (ShareCast) - Premier Oil (LSE: PMO.L - news ) rallied after Jefferies upgraded the stock to 'buy' from 'hold' and raised the price target to 185p from 170p, on the basis of "continued operational delivery in 2H15".

Answer: headquarters_location: Premier Oil, LONDON