Background is defined as "scientific background to understand the rationale and context for the study, and explain the experimental approach." If the following text relates to "Background", return Background. If it does not relate to Background, then return "No Label". 

Text: Classical rabies virus (RABV) is a neurotrophic virus, belongs to genus Lyssavirus of family Rhabdoviridae, and implicated in causing fatal and zoonotic rabies infection in mammals, including human beings (NAME_1 et NAME_2., 2017; NAME_3 et NAME_2., 2018; NAME_3 et NAME_2., 2019). Provide two versions of response separated with exactly 6 asterisk symbols: ******.
user