What of the following is truea) Viral warts spontaneously resolveb) Plantar warts should not be excisedc) Callosity are formed occupationallyd) Corns are viral in etiology
ac
bc
ad
b
Warts

Warts are epidermal growths associated with human papilloma virus (HPV) infection.
Histologically they are characterized by

- hyperkeratosis (hypertrophy of the horny layer)
- acanthosis (hypertrophy of the spinous layer)
- papillomatosis
-  Koilocytes (large keratinocytes with eccenteric nuclei) are seen
Different morphologic types of warts occur on different parts of body.

Verruca vulgaris (or common wart) - fingers and toes
Verruca plantaris (plantar warts) - soles & palms
Verruca plana (flat warts) - face, legs & hands
Condylomata acuminata (veneral warts) - moist areas around the vulva, arms & scrotum

Treatment-
 - warts can be removed by a number of chemicals, including formalin, podophyllum etc.
- surgical excision or curettage with electrodessication can also be used.
- treatment of extensive areas of skin requires surgical excision under general anaesthesia.

Recurrences are common
Some warts are risk factors for squamous cell carcinoma

Corns & Callosities
Corns and callosities both are hyperkeratosis due to chronic excessive pressure or friction on the skin (for eg. callosities on the hands of gardeners and labourers)