Question: What is the nickname of the National Hockey League player born in Helsinki who played 21 NHL seasons?
Sentence (from "Teemu Selänne"): He began his professional career in 1989–90 with Jokerit of the SM-liiga and played 21 seasons in the National Hockey League (NHL) for the Winnipeg Jets, Anaheim Ducks, San Jose Sharks and Colorado Avalanche.
Relevant evidence: No