You will be given a definition of a task first, then some input of the task.
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.

Context : The Samozaryadnaya Vintovka Tokareva, Obrazets 1940 goda (''Tokarev Self-loading Rifle, Model of 1940'', Russian: , 1940 ) or SVT-40 is a Soviet semi-automatic battle rifle.
Subject : SVT-40
Relation : service entry
Output:
What year did SVT-40 come into use?