With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Marlon Brando played a role of a child.
text_B: NOTOC. Æthelfrith was a medieval Bishop of Elmham .. Bishop of Elmham. Bishop of Elmham. Æthelfrith was consecrated in 736 and died sometime after that year .
not_related.