With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Alia Bhatt works in Hollywood.
text_B: Paul A Libby -LRB- born April 9 , 1921 -RRB- is an Emeritus Professor of Mechanical and Aerospace Engineering at the University of California , San Diego , a specialist in the field of Combustion and Aerospace Engineering .. Combustion. Combustion. Aerospace Engineering. Aerospace Engineering. Emeritus Professor. Emeritus Professor
not_related.