Refer to the input text as context and select the correct relationship between 'Berkshire Hathaway' and 'Business Wire' from the available options.
Options: subsidiary, manufacturer, employer, brand

Business Wire is a unit of Warren Buffett's Berkshire Hathaway Inc, and PR Newswire is a unit of Britain's UBM Plc (LSE: UBM.L - news ) .
subsidiary