Utilize the input text as a context reference, choose the right relationship between Asda and retail from the options. Options: 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.

More recently Mr Cain had held senior executive roles and advisory positions with retail and media businesses, but his career history includes a stint at Asda where he played a significant part in the turnaround of the group in the UK.

Answer: industry