Daniel Acker Share on twitter Share on Google Plus by John Kehoe Warren Buffett's biggest ever bet, a $US32.5 billion cash bid for aviation parts manufacturer Precision Castparts, demonstrates how his huge investment conglomerate Berkshire Hathaway is becoming increasingly reliant on big acquisitions to try to materially boost profits.
Take context from the input text and decide on the accurate relationship between 'Berkshire Hathaway' and 'conglomerate' from the options provided.
Options: chief executive officer, stock exchange, developer, industry