With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Respiratory disease can be classified in many different ways.
text_B: The I-League was founded as the top tier of Indian football for the start of the 2007 -- 08 season .. I-League. I-League. Indian football. Football in India. The following page details the football records and statistics of the I-League since then .. I-League. I-League
not_related.