The BBC business show Dragon's Den originally broadcast on BBC Two in the United Kingdom.
The programme launched in 2005 as the British version of an international business-pitch format. Entrepreneurs present their companies to a panel of wealthy investors, known as dragons, and seek investment in exchange for an ownership share.
BBC Two has traditionally carried factual, documentary, entertainment and specialist programming, making it the channel associated with the show's original UK run. The programme later became one of the BBC's best-known business series, but its original home is the key distinction in this question.
Dragon's Den is sometimes confused with Dragons' Den versions in other countries, which have appeared on different broadcasters. The British title uses an apostrophe after “Dragons,” while the channel answer refers specifically to the UK programme.