<human>:  I have a question about social class in Japan. How many classes are there?
<bot>: There are three classes in Japan: the samurai class, the bourgeoisie class, and the proletariat class. The samurai class is the oldest class in Japan, and it is made up of the aristocracy. The bourgeoisie class is made up of the middle class, and the proletariat class is made up of the working class.