Marit Bjørgen wins an earlier race in the tournament - Heiko Junge/Scanpix
Bjørgen raced with Ingvild Flugstad Østberg in the relay, where teams of two women each perform three alternate sprints.
In a clean sweep for the nordic nations, Norway finished in 16 min 4.05sec, with Finland 9.09sec behind for silver. Sweden took the bronze in 16min 23.82sec.
Bjørgen had already won the skiathlon at Sochi 2014 to go with her three golds from Vancouver 2010.