Lactose is synthesised by an enzyme called lactose synthase that combines monosaccharide (s) called 

The frequency of ALDH2*504Lys hs been measured in over 350 human populations. It is effectively absent in all parts of the world apart from populations in East Asia. The spots on the map given below indicate sampled populations and the key shows the shades of black used to indicate the frequency of ALDH2*504Lys. 

Which are the three countries with a high frequency of the ALDH2*504Lys according to the given map?