Boric acid is used as an _____.

Antiseptic

The correct answer is option 3.  Antiseptic.

Boric acid is used as an Antiseptic.

Boric acid has antiseptic properties and is commonly used as an antiseptic agent to prevent infections and treat minor cuts, wounds, and skin irritations. It is often found in various topical antiseptic solutions and ointments. Additionally, boric acid is also used in other applications such as insecticides, flame retardants, and as a precursor in the synthesis of other chemical compounds.