The drug of choice for syphilis treatment is

Choice A reason: Herpes simplex virus is incorrect because it is not the infection described in the question. It is transmitted through direct contact with the skin or mucous membranes of someone who is infected, usually through oral or genital sex. Symptoms include painful blisters and sores in the mouth or genitals. It does not cause life-threatening infections, but it can increase the risk of other sexually transmitted infections.

Choice B reason: Human papillomavirus is incorrect because it is not the infection described in the question. It is transmitted through direct contact with the skin or mucous membranes of someone who is infected, usually through genital sex. Symptoms include genital warts and cervical cancer. It does not cause life-threatening infections, but it can increase the risk of other cancers.

Choice C reason: Human immunodeficiency virus is correct because it is the infection described in the question. It is transmitted through direct contact with the blood or body fluid of someone who is infected, usually through unprotected sex, sharing needles, or passed from a mother to a baby at birth. Symptoms may take 10 years or more to show. Once they appear, the person is susceptible to life-threatening infections, such as pneumonia, tuberculosis, or cancer. This condition is also known as acquired immunodeficiency syndrome (AIDS).

Choice D reason: Cytomegalovirus is incorrect because it is not the infection described in the question. It is transmitted through direct contact with the saliva, urine, or breast milk of someone who is infected, usually through kissing, sexual contact, or breastfeeding. Symptoms are usually mild or absent in healthy people, but they can be serious in people with weakened immune systems or unborn babies. It does not cause life-threatening infections, but it can cause birth defects, hearing loss, or vision problems.

Choice A reason: The incidence of hepatitis C is not decreasing, but rather increasing, especially among young people who inject drugs. Hepatitis C is a chronic infection that can lead to liver damage and cancer.

Choice B reason: Hepatitis B is more contagious than HIV, as it can be transmitted by blood, semen, vaginal fluids, and other body fluids. Hepatitis B can also cause chronic infection and liver problems.

Choice C reason: A vaccine exists for hepatitis B but not for hepatitis C. Hepatitis B vaccine is recommended for all infants, children, and adults who are at risk of exposure. Hepatitis C vaccine is still under development.

Choice D reason: Hepatitis A is caused by eating contaminated food or drinking polluted water. It is an acute infection that usually resolves on its own. Hepatitis A vaccine is available for travelers and people who live in areas with poor sanitation.