Take context from the input text and decide on the accurate relationship between 'Berkshire Hathaway' and 'Warren Buffett' from the options provided.
Options: director/manager, subsidiary, product/material produced, stock exchange

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.
director/manager