What disease is commonly transmitted by direct contact?

The option specifying sexually transmitted diseases is accurate because these infections are primarily spread through direct contact during sexual activities. This includes contact with bodily fluids such as blood, semen, vaginal fluids, and sometimes skin-to-skin contact. The intimate nature of sexual interactions makes direct contact a critical factor in the transmission of these diseases, making it essential for individuals to practice safe measures, such as using condoms.

HIV, while also a sexually transmitted disease, falls under the broader category of sexually transmitted diseases, but the option that explicitly highlights sexually transmitted diseases captures the essence of the question more accurately. Influenza primarily spreads through respiratory droplets when an infected person coughs or sneezes, and tuberculosis is primarily transmitted through airborne particles, rather than direct contact.