Which metal urn with a central tube, traditionally heated by charcoal, is used to boil water and keep tea warm for hours?

• A Brazier
• B Cauldron
• C Samovar ✓
• D Chafing dish

The samovar (literally 'self-boiler') originated in the Urals in the 18th century and became the centrepiece of the traditional tea-drinking ritual.