With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jon Pertwee took part in Worzel Gummidge.
text_B: 2-Chlorobutane is a compound of chlorine , hydrogen , and carbon .. compound. Chemical compound. chlorine. chlorine. hydrogen. hydrogen. carbon. carbon. It is also called sec-butyl chloride .. Category  : Chloroalkanes
not_related.