With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bulgaria has an economic system.
text_B: Lesbian , gay , bisexual , and transgender -LRB- LGBT -RRB- persons in Tunisia face legal challenges not experienced by non-LGBT residents .. Tunisia. Tunisia. LGBT. LGBT. Both male and female same-sex sexual activity is illegal in Tunisia , and there is only one official organised LGBT-rights movement named `` Shams '' .. Tunisia. Tunisia. LGBT. LGBT
not_related.