Which compound is a biguanide antiseptic that binds to the outer surface of the skin, producing some residual activity?

Question

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Chlorhexidine is a biguanide antiseptic that binds to the outer surface of the skin, producing some residual activity. Povidone-iodine is an iodine-based antiseptic that has a broad spectrum of activity but is not a biguanide. Benzalkonium chloride is a quaternary ammonium compound that can be used as an antiseptic, but it does not bind to the skin surface like biguanides. Hexachlorophene is a chlorinated phenol that is no longer used as an antiseptic due to concerns about its neurotoxicity.

Which Compound Is a Biguanide Antiseptic That Binds to the Outer