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".
In the context of the input sentence, determine the relationship between 'Premier Oil' and 'LONDON'.
Options: headquarters location, stock exchange, creator, distribution format