Of the following disorders,which is caused by a virus?

A) Corns.
B) Plantar warts.
C) Athlete's foot.
D) Callus.

Plantar Warts

Hard, grainy growths that appear on the heels or balls of the feet, caused by the human papillomavirus (HPV), and often feel like a stone in the shoe.

Virus

A microscopic infectious agent that can only replicate inside the living cells of an organism, causing various diseases in humans, animals, and plants.

Corns

Hardened areas of skin that usually form on the toes due to friction and pressure.