Table: toxicity_data
Columns: method_of_administration_citation_needed
category_1
category_2
category_3
category_4
category_5

Question: What's the sum of all values in category 1 when category 3 is equal to 300?
SQL: SELECT SUM("category_1") FROM toxicity_data WHERE "category_3" = '300'

Question: If category 1 is 0.05, what is category 3?
SQL: SELECT "category_3" FROM toxicity_data WHERE "category_1" = 0.05