title: Dom Pérignon
context: Dom Pérignon (/ˌdɒmpɛrɪnˈjɒn/; French pronunciation:​[dɔ̃ peʁiɲɔ̃]) is a brand of vintage Champagne produced by the Champagne house Moët & Chandon and serves as that house's prestige champagne. It is named after Dom Pérignon, a Benedictine monk who was an important quality pioneer for Champagne wine but who, contrary to popular myths, did not discover the champagne method for making sparkling wines.[1]
question: What is the most expensive Champagne?
answers: Dom Pérignon