With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Performance (film) stars a member of The Rolling Stones.
text_B: A Marine Sanitation Device , or commonly known as an `` MSD '' is a specific piece of machinery or system of machinery that is dedicated to treat , process , and / or store raw , untreated sewage that can accumulate onboard water vessels .. It does not refer to portable devices such as portable toilets .
not_related.