With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robbie Collin studied existentialism.
text_B: The Treaty Room is located on the second floor of the White House , the official residence of the President of the United States .. White House. White House. official residence. official residence. President of the United States. President of the United States. The room is a part of the first family 's private apartments and is used as a study by the president .
not_related.