Final answer:
The viral sexually transmitted disease among the given options is HIV/AIDS. This infection is caused by the human immunodeficiency virus (HIV), and unlike bacterial STIs that can be cured with antibiotics, HIV/AIDS cannot be cured.
Step-by-step explanation:
The sexually transmitted disease (STD) among the options provided that is viral is D) HIV/AIDS. Sexually transmitted infections (STIs) caused by viruses, such as genital herpes, human papillomavirus (HPV) infection, and HIV/AIDS, cannot be cured. In contrast, STIs that are bacterial in nature—like chlamydia, gonorrhea, and syphilis—can often be cured with antibiotics. HIV causes AIDS (Acquired Immunodeficiency Syndrome), which is a condition where the immune system gets severely weakened due to the virus. While advances in medical treatment have made it possible to manage HIV and prevent the development of AIDS, there is no cure for the virus itself. It is important to practice safe sex to prevent transmission of viral STIs, and vaccinations are available for preventable infections such as HPV.