What is the relationship between Man Group and LONDON in the context of the input sentence. Choose an answer from: 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) - (ShareCast News) - Shares (Berlin: DI6.BE - news ) in Man Group (LSE: EMG.L - news ) slumped following a press report that the chairman of the hedge fund manager's China unit, Li Yifei, has been taken into custody by Chinese authorities to assist with a police probe into market volatility.

Answer: headquarters_location