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

**Core Concept**
Viral warts, also known as verrucas, are a common skin condition caused by the human papillomavirus (HPV). They can affect various parts of the body, including the hands, feet, and genital area.

**Why the Correct Answer is Right**
Viral warts are caused by the HPV virus, which infects the skin cells and leads to the formation of abnormal growths. These growths can be painful and unsightly, but they often resolve on their own without treatment. In fact, studies have shown that up to 60% of viral warts will spontaneously resolve within 2 years. This is because the immune system can eventually clear the virus, leading to the disappearance of the wart. However, some warts may persist and require treatment.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while some viral warts may resolve on their own, others may persist and require treatment.

**Option B:** This option is incorrect because plantar warts, which occur on the soles of the feet, can be painful and may require excision to prevent further irritation and discomfort.

**Option C:** This option is incorrect because callosities, also known as calluses, are formed due to repeated friction or pressure on the skin, not occupationally. They can be painful and may require treatment to prevent further irritation.

**Option D:** This option is incorrect because corns are formed due to pressure or friction on a specific area of the skin, not due to a viral etiology. They can be painful and may require treatment to prevent further irritation.

**Clinical Pearl / High-Yield Fact**
It's essential to recognize that viral warts can be contagious and can be spread through skin-to-skin contact, making proper hygiene and treatment essential to prevent the spread of the virus.

**Correct Answer:** a) Viral warts spontaneously resolve