Question: Ababen hawa masu amfani da injina da aka samar a yanzu an tsara su ne domin su yi amfani da gas. Injina masu amfani da gas suna yin illa ga birane ta hanyar rage
Options:
gurɓacewar iska
gurɓatar zafi 
gurɓataccen sauti 
gurɓatar haske
Answer: A