Antonym of VIRULENT

Answer: Option A

Virulent : (of a disease or poison) extremely severe or harmful in its effects.
Harmless : not able or likely to cause harm.
Malignant : evil in nature or effect; malevolent.
Hostile : showing or feeling opposition or dislike; unfriendly.
Vicious : deliberately cruel or violent.

Antonym of Virulent is Harmful