question: In 1939 , what caused nearly 2 million Koreans to be forced into the labor force or the army ?
answer: Conscription
turker_answer: Conscription caused nearly 2 million Koreans to be forced into the labor force or the army in 1939 .
rule-based: In 1939 , conscription caused nearly 2 million Koreans to be forced into the labor force or the army .