With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mike Tyson fought heavyweight boxer Evander Holyfield.
text_B: Udon Thani Rajabhat University -LRB- UDRU -RRB- is a university in Udon Thani , northeast Thailand .. Udon Thani. Udon Thani. Thailand. Thailand. It confers associate , bachelors , masters , and doctoral degrees .
not_related.