Social dialect is a language variant formed by the different nature of social groups. It is a language used in a social group, social class or subculture group. It is a language difference formed by different occupation, social status, political belief, education level or social communication habits composed of these factors. The main differences are language style and expression, as well as the use of some special words.
According to the above definition, which of the followings is not a social dialect?
Student accent