user: Question: What's the sum of all values in category 1 when category 3 is equal to 300?
Columns: ['Method of administration[ citation needed ]', 'Category 1', 'Category 2', 'Category 3', 'Category 4', 'Category 5']
Types: ['text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['Oral: LD50 measured in mg/kg of bodyweight', 5.0, 50.0, '300', '2 000', '5 000']
SQL:

assistant: SELECT SUM("Category 1") FROM "Table" WHERE "Category 3" = '300';