system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
Who was the United Kingdom's longest-serving prime minister?
gpt
Sir Robert Walpole is the longest-serving prime minister of the United Kingdom to date. He had a single term as prime minister, which began in 1721 and ended after almost 21 years when he resigned from office.