Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.
Text: Getty Images Share on twitter by Jacob Greber Reserve Bank of Australia governor Glenn Stevens has challenged his US counterpart Janet Yellen to shun fears of upsetting financial markets by getting on with hiking for the first time in nine years the world's most important official interest rate.
user
employer: Glenn Stevens, Reserve Bank of Australia
assistant