 <translate> Japenese yen was invented as a form of currency.is the reasoning for what question and answer pair? <yor> A ṣe àgbéyẹ̀wò yen ti Japan gẹ́gẹ́ bí oríṣi owó kan. Kí ni ìdí tí ìbéèrè àti ìdáhùn méjèèjì yìí fi jẹ́? 