With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Julie Christie starred in a film.
text_B: Pterostylis alpina , commonly known as the mountain greenhood , is a species of orchid endemic to south-eastern Australia .. Pterostylis. Pterostylis. orchid. orchid. endemic. Endemism. Australia. Australia. It has a rosette of fleshy leaves at the base and usually only one white flower with green markings and back-swept lateral sepals .
not_related.