With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Harley Quinn has not been portrayed by Mia Sara.
text_B: Whiteleaf may refer to  :. Whiteleaf , Buckinghamshire. Whiteleaf Cross , after which the above hamlet is named. Whiteleaf Cross. Whiteleaf Cross. Whiteleaf Public School. Whiteleaf Public School. Whiteleaf Public School
not_related.