With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Kevin Durant was a college basketball player.
text_B: Planet of Evil is the second serial of the 13th season of the British science fiction television series Doctor Who .. serial. list of Doctor Who serials. 13th season. Doctor Who ( season 13 ). science fiction television. science fiction television. Doctor Who. Doctor Who. It was first broadcast in four weekly parts from 27 September to 18 October 1975 .
not_related.