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".
Take context from the input text and decide on the accurate relationship between 'Premier Oil' and 'LONDON' from the options provided.
Options: headquarters location, distribution format, stock exchange, creator