Refer to the input text as context and select the correct relationship between 'Warren Buffett' and 'Berkshire Hathaway' from the available options.
Options: brand, operator, legal form, owner of

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