user: Question: What is the namesake of the feature found at 189.5W longitude? 
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter', 'Year named', 'Namesake']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Abydos Facula', '33.4N', '153.4W', '180.0', 1985.0, 'Egyptian town where Osiris was worshipped.']
SQL:

assistant: SELECT "Namesake" FROM "Table" WHERE "Longitude" = '189.5W';