user: Question: What is Varricchio's unit?
Columns: ['Name', 'Novelty', 'Status', 'Authors', 'Unit', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Austriadactylus', 'gen et sp nov', 'Valid', 'Dalla Vecchia, Wild, & Reitner', 'Seefelder Beds', 'Austria']
SQL:

assistant: SELECT "Unit" FROM "Table" WHERE "Authors" = 'Varricchio';