Final answer:
The incorrect statement about STDs is that they always present with visible symptoms, which is not true as many can be asymptomatic. Condoms can reduce but not eliminate the risk of transmission of STDs, and STDs can have bacterial, viral, or parasitic origins.
Step-by-step explanation:
The statement about sexually transmitted diseases (STDs) that is incorrect is c) STDs always present with visible symptoms. This statement is false because many STDs can be asymptomatic, meaning they do not always show any symptoms. It is important to note that while some STDs can be prevented by using condoms, condoms are not 100% effective in preventing the transmission of all STDs.
Examples of STDs that often go unnoticed include chlamydia and HPV because they can be asymptomatic. Bacterial STDs, like chlamydia, gonorrhea, and syphilis, can be treated with antibiotics; however, viral STDs, such as herpes or HIV, have no cure, though their symptoms and progression can often be managed with medication.