Which (if any) of the following statements regarding chickenpox, smallpox, and syphilis is correct?

a. all can be transmitted through contact with the rash/lesion

b. all can cause congenital infection

c. all can be prevented by vaccination

d. all are caused by viruses

a. all can be transmitted through contact with the rash/lesion

Explanation:

All the three diseases i. e. chickenpox, smallpox, and syphilis can be transmitted through contact with the rash/lesion.

Chicken pox: Chickenpox is a viral infection in which red blisters appear on the skin. It is caused by Varicella-zoster virus.

Smallpox: Smallpox was certified the global eradication by WHO in the year of 1980. Smallpox is a viral infection caused by the Variola virus. Variola viruses are of two types named Variola major and Variola minor.

Syphilis: Syphilis is a bacterial disease which is the most dangerous infection spread through sexual contact.