Which who region has the highest percentage of adolescents who are current drinkers? africa western pacific europe south-east asia?

The correct answer is Europe

Europe has a huge percent of adolescent drinkers, much higher than any other region in the world. For young Europeans it is common to drink at parties from a young age, sometimes even before they become of age since it's easy to obtain alcohol. Famous regions for this are Finland, Russia, Eastern and South Eastern Europe, and some other parts as well.