With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The United States Environmental Protection Agency began operation after Nixon was impeached.
text_B: The anal canal is the terminal part of the large intestine .. large intestine. large intestine. It is situated between the rectum and anus , below the level of the pelvic diaphragm .. rectum. rectum. anus. anus. pelvic diaphragm. pelvic diaphragm. It lies in the anal triangle of perineum in between the right and left ischioanal fossa .. anal triangle. anal triangle. perineum. perineum. ischioanal fossa. ischioanal fossa. The anal canal is divided into three parts .. The zona columnaris is the upper half of the canal and is lined by simple columnar epithelium .. simple columnar epithelium. simple columnar epithelium. The lower half of the anal canal , below the pectinate line , is divided into two zones separated by Hilton 's white line .. pectinate line. pectinate line. The two parts are the zona hemorrhagica and zona cutanea , lined by stratified squamous non-keratinized and stratified squamous keratinized epithelium , respectively .. stratified squamous non-keratinized. stratified squamous epithelium. stratified squamous keratinized. stratified squamous epithelium. In humans it is approximately 2.5 to 4 cm long , extending from the anorectal junction to the anus .. anus. anus. It is directed downwards and backwards .. It is surrounded by inner involuntary and outer voluntary sphincters which keep the lumen closed in the form of an anteroposterior slit .. lumen. lumen ( anatomy ). It is differentiated from the rectum by the transition of the internal surface from endodermal to skinlike ectodermal tissue .. rectum. rectum. endodermal. endodermal. ectodermal. ectodermal
not_related.