Utilize the input text as a context reference, choose the right relationship between 'Berkshire Hathaway' and 'Warren Buffett' from the options.
Options: chief executive officer, currency, manufacturer, location of formation

NEW YORK (Reuters) - Billionaire investing icon Warren Buffett said on Tuesday that there are dozens of countries in which his sprawling Berkshire Hathaway conglomerate would be interested in buying new businesses.
chief executive officer