Which is not a first-generation chemical plaque control agent?: (A) Phenol, (B) Antibiotics, (C) CHX, (D) Sanguinarine
Answer is C. Chemical plaque control agents
First generation:

Eg: Antibiotics, phenol quaternary ammonium compounds and sanguinarine.

Second generation:

Bisbiguanides (Chlorhexidine)

Third generation

Delmopinol