Refer to the input text as context and select the correct relationship between 'Prime' and 'retail' from the available options.
Options: owned by, manufacturer, industry, business division

The complexities of running a government can't be underestimated, and the new Prime Minister and his staff got a blast of the retail end of those complexities this week when they found themselves having to run the government without the machinery in place to do it, and facing three days of Parliament.
industry