With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Marcus Allen was a pop singer.
text_B: Parental alienation syndrome -LRB- abbreviated as PAS -RRB- is a term coined by Richard A. Gardner in the early 1980s to refer to what he describes as a disorder in which a child , on an ongoing basis , belittles and insults one parent without justification , due to a combination of factors , including indoctrination by the other parent -LRB- almost exclusively as part of a child custody dispute -RRB- and the child 's own attempts to denigrate the target parent .. Richard A. Gardner. Richard A. Gardner. insults. insults. child custody. child custody. Gardner introduced the term in a 1985 paper , describing a cluster of symptoms he had observed during the early 1980s .. Parental alienation syndrome is not recognized as a disorder by the medical or legal communities and Gardner 's theory and related research have been extensively criticized by legal and mental health scholars for lacking scientific validity and reliability .. However , the separate but related concept of parental alienation , the estrangement of a child from a parent , is recognized as a dynamic in some divorcing families .. parental alienation. parental alienation. Psychologists differentiate between parental alienation and parental alienation syndrome by linking parental alienation with behaviors or symptoms of the parents , while parental alienation syndrome is linked to hatred and vilification of a targeted parent by the child .. parental alienation. parental alienation. The admissibility of PAS has been rejected by an expert review panel and the Court of Appeal of England and Wales in the United Kingdom and Canada 's Department of Justice recommends against its use .. admissibility. Admissible evidence. Court of Appeal of England and Wales. Court of Appeal of England and Wales. United Kingdom. United Kingdom. PAS has been mentioned in some family court cases in the United States .. family court. family court. United States. United States. Gardner portrayed PAS as well accepted by the judiciary and having set a variety of precedents , but legal analysis of the actual cases indicates that as of 2006 this claim was incorrect .. No professional association has recognized PAS as a relevant medical syndrome or mental disorder , and it is not listed in the International Statistical Classification of Diseases and Related Health Problems of the WHO or in the American Psychiatric Association 's Diagnostic and Statistical Manual of Mental Disorders -LRB- DSM -RRB- .. International Statistical Classification of Diseases and Related Health Problems. International Statistical Classification of Diseases and Related Health Problems. WHO. WHO. American Psychiatric Association. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. Diagnostic and Statistical Manual of Mental Disorders
not_related.