Question:
Who was the head coach of the team Sweden men's national ice hockey team in Dec, 1975?

Context:
 Pär Mårts is the head coach of Sweden men's national ice hockey team from Jan, 2010 to Jan, 2016. 
 Bengt Ohlson is the head coach of Sweden men's national ice hockey team from Jan, 1980 to Jan, 1981. 
 Conny Evensson is the head coach of Sweden men's national ice hockey team from Jan, 1990 to Jan, 1992. 
 Kjell Svensson is the head coach of Sweden men's national ice hockey team from Jan, 1972 to Jan, 1974. 
 Rikard Grönborg is the head coach of Sweden men's national ice hockey team from Jan, 2016 to Jan, 2019. 
 Claes-Göran Wallin is the head coach of Sweden men's national ice hockey team from Jan, 2004 to Feb, 2005. 
 Bengt-Åke Gustafsson is the head coach of Sweden men's national ice hockey team from Feb, 2005 to Jan, 2010. 
 Peter Wallin is the head coach of Sweden men's national ice hockey team from Jan, 1998 to Jan, 2000. 
 Arne Strömberg is the head coach of Sweden men's national ice hockey team from Jan, 1960 to Jan, 1971. 
 Anders Hedberg is the head coach of Sweden men's national ice hockey team from Jan, 2000 to Jan, 2002. 
 Ed Reigle is the head coach of Sweden men's national ice hockey team from Jan, 1957 to Jan, 1960. 
 Folke "Masen" Jansson is the head coach of Sweden men's national ice hockey team from Jan, 1956 to Jan, 1957. 
 Leif Boork is the head coach of Sweden men's national ice hockey team from Jan, 1984 to Jan, 1985. 
 Tommy Sandlin is the head coach of Sweden men's national ice hockey team from Jan, 1986 to Jan, 1990. 
 Kent Forsberg is the head coach of Sweden men's national ice hockey team from Jan, 1995 to Jan, 1998. 
 Johan Garpenlöv is the head coach of Sweden men's national ice hockey team from Jan, 2019 to Jan, 2022. 
 Anders Parmström is the head coach of Sweden men's national ice hockey team from Jan, 1981 to Jan, 1984. 
 Sam Hallam is the head coach of Sweden men's national ice hockey team from Jan, 2022 to Dec, 2022. 
 Ronald Pettersson is the head coach of Sweden men's national ice hockey team from Jan, 1974 to Jan, 1976. 
 Curt Lundmark is the head coach of Sweden men's national ice hockey team from Jan, 1992 to Jan, 1995.

Answer:
Ronald Pettersson