user: Question: Which category was Michael Stewart a nominee in?
Columns: ['Year', 'Award', 'Category', 'Nominee', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1975.0, 'Tony Award', 'Best Musical', 'Best Musical', 'Nominated']
SQL:

assistant: SELECT "Category" FROM "Table" WHERE "Nominee" = 'Michael Stewart';