With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: NASA is responsible for the Skylab space station, launched in 1980.
text_B: There are multiple mosques named some variation of Al Khair Mosque  :. Al Khair Mosque , Sana'a , Yemen. Al Khair Mosque , Singapore , has a capacity of 3300 worshipers
not_related.