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.

Dubai is the offshore territory where Food For Health sells most, through the Spinneys supermarket chain, for whose newsletter Plapp writes regular diet advice, and explains some of her more exotic ingredients like slippery elm, amaranth and teff.

Answer: headquarters_location: Spinneys, Dubai