Question: Russian Roulette is the which number studio album by German heavy metal band Accept, released in 1986, it would be the last Accept album to feature Udo Dirkschneider as lead vocalist, Dirkschneider is a German heavy metal singer? 
Context: Blood of the Nations is the twelfth studio album by German heavy metal band Accept.  It is the band's first studio recording since 1996's "Predator" and the first album to feature vocalist Mark Tornillo and drummer Stefan Schwarzmann.  It is the first Accept album without Udo Dirkschneider on vocals since "Eat the Heat" (1989), and the band's first album to feature guitarist Herman Frank since "Balls to the Wall" (1983). Udo Dirkschneider (born 6 April 1952) is a German heavy metal singer who rose to fame with German heavy metal band Accept.  After leaving Accept in 1987, he formed U.D.O., with whom he has enjoyed commercial success as well. Accept is a German heavy metal band from the town of Solingen, originally assembled by former vocalist Udo Dirkschneider, guitarist Wolf Hoffmann and bassist Peter Baltes.  Their beginnings can be traced back to the late 1960s.  The band played an important role in the development of speed and thrash metal, being part of the German heavy metal scene, which emerged in the early to mid-1980s.  Accept achieved commercial success with their fifth studio album "Balls to the Wall" (1983), which is the band's only album to be certified gold in the United States and Canada, and spawned their well-known hit "Balls to the Wall". Bad Steve was a German heavy metal band composed of former Accept members Jan Koemmet, Frank Friedrich and Dieter Rubach, as well as former members of more obscure bands Kanaan and Sin City.  They supported Accept on a 1984 tour in Germany.  Rubach later had a brief stint with Accept vocalist Udo Dirkschneider's band U.D.O. Koemmet had been with Accept previous to their recording career and re-entered that band briefly between their releases "Breaker" and "Restless and Wild". Accept is a German heavy metal band from the town of Solingen, originally assembled by former vocalist Udo Dirkschneider, guitarist Wolf Hoffmann and bassist Peter Baltes.  Though Accept did not actually exist until 1976, their beginnings can be traced back to the late 1960s when Dirkschneider formed the local band Band X.  The band played an important role in the development of speed metal and Teutonic thrash metal.  Their 1983 album, "Balls to the Wall", subsequently became their most successful release, featuring its well-known hit of the same title. Objection Overruled is the ninth studio album by German heavy metal band Accept, released in 1993.  It is the first to feature Udo Dirkschneider on lead vocals since 1986's "Russian Roulette".  It was recorded at Dierks-Studios in Stommeln after pre-production at Roxx Studios. Russian Roulette is the seventh studio album by German heavy metal band Accept, released in 1986.  It was again recorded at Dierks-Studios, but the band chose to self-produce rather than bring back Dieter Dierks as producer.  It would be the last Accept album to feature Udo Dirkschneider as lead vocalist until the 1993 reunion album "Objection Overruled". Predator is the eleventh studio album by German heavy metal band Accept, released in 1996.  It was produced by Michael Wagener and recorded at 16th Ave. Sound Studios, Nashville, Tennessee.  "Predator" was Accept's last album before their hiatus from 1997, and their last recording with singer Udo Dirkschneider. Restless and Wild is the fourth studio album by German heavy metal band Accept, released in 1982 in Continental Europe and in 1983 in the US and UK.  It was the first Accept album to not be recorded at Delta-Studio, the band moving to Dieter Dierks' studio in Stommeln.  It is also the first Accept album in which Udo Dirkschneider sings every track, as well as the first in which manager Gaby Hauke ("Deaffy") gains credits for songwriting.  Michael Wagener took engineering and mixing duties once again. Bill Hudson is a Brazilian heavy metal guitarist.  He currently works with German heavy metal bands U.D.O and Dirkschneider, both fronted by former Accept vocalist Udo Dirkschneider.
Answer: seventh