Q.Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

Sexually transmitted diseases (also called venereal diseases, reproductive tract infections, or STIs) spread mainly through intimate sexual contact with an infected partner, though Hepatitis-B and HIV can also spread via shared needles/instruments, blood transfusion, or mother-to-child transmission; people aged 15–24 are especially at risk. STIs are classed by causative organism: bacterial (gonorrhoea, syphilis, chlamydiasis, lymphogranuloma venereum — all curable with antibiotics), viral (genital herpes, genital warts, Hepatitis-B, AIDS — symptom-manageable but not curable), fungal (candidiasis) and protozoan (trichomoniasis). Prevention rests on avoiding unknown/multiple partners, consistent condom use (which greatly, but not completely, reduces risk), and prompt medical consultation. HPV, a viral STI, additionally causes cervical cancer — screenable via PAP smear and preventable through HPV vaccination of girls aged 9–13 — linking STD prevention directly to cancer prevention. India carries the world's third-largest HIV burden (~2.1 million people living with HIV).