instruction:
You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.
question:
Context : Slash'EM (Super Lotsa Added Stuff Hack - Extended Magic) is a variant of the roguelike game NetHack that offers extra features, monsters, and items. 
Subject : Slash'EM 
Relation : based on
answer:
The Slash'EM is based upon what?


question:
Context : The 2015 Canadian Grand Prix, formally known as the Formula 1 Grand Prix du Canada 2015, was a Formula One motor race held on 7 June 2015 at the Circuit Gilles Villeneuve in Montreal, Canada. 
Subject : 2015 Canadian Grand Prix 
Relation : point in time
answer:
What is the date when 2015 Canadian Grand Prix happened?


question:
Context : When the Federal German Navy was established in 1956, Dochet and Flint were acquired and classified as Type 139 patrol trawlers. 
Subject : Type 139 patrol trawler 
Relation : service entry
answer:

In which year was the service entry date for Type 139 patrol trawler?