Which vaccine may be administered to boys and young men aged 9 to 26 years to reduce the likelihood of genital warts?

The human papillomavirus (HPV) vaccine, particularly the 9-valent formulation (HPV9), is specifically designed to protect against certain strains of HPV that are known to cause genital warts, as well as various forms of cancer, such as cervical cancer and oropharyngeal cancer. The vaccine is recommended for boys and young men aged 9 to 26 years, as it has been shown to significantly reduce the likelihood of developing genital warts caused by HPV types 6 and 11, which are responsible for the majority of these cases.

The other vaccines listed do not target HPV and its associated conditions. Hepatitis A and Hepatitis B vaccines focus on providing immunity against their respective viruses, which cause liver diseases, while VAR (varicella) vaccine protects against chickenpox, unrelated to genital warts or HPV. Therefore, the appropriate vaccine for reducing the likelihood of genital warts in the specified age group is the HPV vaccine.