Which form of contraception may contain an antiviral lubricant?

The answer is correct because certain types of condoms, particularly those made of polyurethane or polyisoprene, may be lubricated with antiviral substances, such as nonoxynol-9. This lubricant helps reduce the transmission of sexually transmitted infections (STIs) while providing a barrier to prevent pregnancy. The use of condoms as a contraceptive method is not only about preventing pregnancy but also protecting against STIs, making them unique among contraceptive options.

In contrast, foams do not typically contain antiviral lubricants; they are primarily designed as a spermicide. An IUD (Intrauterine Device) is a form of birth control that does not involve lubricants since it is a physical device placed in the uterus. Birth control pills are hormonal methods of contraception and do not include any lubricants, antiviral or otherwise, as they work systemically rather than as a barrier. Thus, among the options provided, condoms stand out for potentially having antiviral lubricants that contribute to both contraceptive effectiveness and STI prevention.