With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: This Is Us has Chrissy Metz as a piece of the cast.
text_B: Pamela B. Davis , MD , PhD is a pediatric pulmonologist specializing in cystic fibrosis research .. pediatric. pediatric. cystic fibrosis. cystic fibrosis. She has been Dean of the School of Medicine at Case Western Reserve University since 2007 .. Case Western Reserve University. Case Western Reserve University. She was elected to the Institute of Medicine in 2014 .. Institute of Medicine. Institute of Medicine
not_related.