Correct Answer: A
Explanation:
Meaning: Adjuvant means furnishing added support.
One who helps or facilitates; an assistant.
It also refers to an additive that enhances the effectiveness of medical treatment.
Example: It is added to other medicines, either as a corrective, or adjuvant.
Synonyms: Additional, Accessory, Auxiliary, Contributory
Antonyms: Necessary, Needed