With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Patrick Wilson's birthday is August 3.
text_B: An apochromat , or apochromatic lens -LRB- apo -RRB- , is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses .. photographic. Photographic lens. lens. Lens ( optics ). chromatic. chromatic aberration. spherical aberration. spherical aberration. achromat. achromat
not_related.