With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robert Downey Jr. is an entertainer.
text_B: Melissa Ponzio -LRB- born August 3 , 1972 -RRB- is an American actress , best known for her roles as Melissa McCall on Teen Wolf and Karen on -LSB- -LSB- The Walking Dead -LRB- TV series -RRB-  |  The Walking Dead -RSB- -RSB- .. American. Americans. Teen Wolf. Teen Wolf ( 2011 TV series ). Karen. Karen ( The Walking Dead ). Most recently , Ponzio has starred in Chicago Fire '' as Donna Robbins .. Chicago Fire. Chicago Fire ( TV series )
not_related.