With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco is a town.
text_B: In human anatomy , the greater sac , also known as the general cavity -LRB- of the abdomen -RRB- or peritoneum of the peritoneal cavity proper , is the cavity in the abdomen that is inside the peritoneum but outside the lesser sac .. lesser sac. lesser sac. human anatomy. human anatomy. peritoneal cavity. peritoneal cavity. abdomen. abdomen. It is connected with the lesser sac via the omental foramen , also known as the foramen of Winslow or epiploic foramen , which is anteriorly bounded by the portal triad -- portal vein , hepatic artery , and common bile duct .. lesser sac. lesser sac. omental foramen. omental foramen. portal vein. portal vein. hepatic artery. hepatic artery. common bile duct. common bile duct
not_related.