The correct option is A Griseofulvin
Griseofulvin is an antibiotic used to treat fungal infections. It is mainly used for infections occurring on the skin or scalp caused by scalp ringworm (also called tinea capitis). Whereas chloramphenicol is an antibiotic, cycocel is a plant growth regulator and ethylene is used as a plant hormone. Thus, the correct answer is option A.