With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Chris O'Dowd appeared in Orphan Black.
text_B: The Central Power Engineering Service is a Central Civil Services Group-A & Group-B Gazetted technical post of the Government of India .. Through Engineering Services Examination -LRB- ESE -RRB- , both group A and Group B post are filled in Central Power Engineering .
not_related.