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 Weimar Republic, the successor state to the German Empire, implemented a program designed to update their remaining supplies of Gewehr 98 rifles for the Reichswehr in the years following World War I. Rifles allowed into service with the early Weimar security forces were stamped with a ``1920'' marking on their receiver ring. 
Subject : Gewehr 98 
Relation : conflict
In which war/battle did Gewehr 98 fight?

Context : William Ross Knudsen (1892-1977) was an American socialist political activist and trade union organizer. 
Subject : William Ross Knudsen 
Relation : residence
What city is William Ross Knudsen from?

Context : Born in Stockholm (Sweden), and then raised in Geneva (Switzerland) and Madrid (Spain), Juan Manuel Abras spent his adolescence in Buenos Aires, Venice and Bilbao, and his youth in Vienna and Kraków, receiving his music education while living in Austria, Germany, Italy, Poland, Spain and Argentina along with his family (his father being a diplomat and journalist, his mother being a sociologist and piano teacher). 
Subject : Juan Manuel Abras 
Relation : occupation

What was Juan Manuel Abras's career?