With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Music includes jazz.
text_B: Mendel Sachs -LRB- -LSB- zɑːks -RSB- April 13 , 1927 -- May 5 , 2012 -RRB- was an American theoretical physicist .. His scientific work includes the proposal of a unified field theory that brings together the weak force , strong force , electromagnetism , and gravity .. unified field theory. unified field theory. weak force. weak force. strong force. strong force. electromagnetism. electromagnetism. gravity. gravity
not_related.