Final answer:
Reproductive pathogens enter through the genital tract and include diseases such as chlamydia, gonorrhea, and HIV. These pathogens require close mucous membrane contact for transmission, often during sexual activity.
Step-by-step explanation:
The pathogens that enter via the genital tract are C) Reproductive pathogens. These pathogens are typically spread through sexual contact and require direct contact between mucous membranes or their secretions to infect a new host. Some examples of sexually transmitted diseases caused by these pathogens include chlamydia, gonorrhea, and HIV. These diseases are part of a broader category known as sexually transmitted infections (STIs), which can also be transmitted through other bodily fluids such as blood and breast milk in certain cases.
Pathogens that are transmitted sexually or through the reproductive tract exploit the genital mucosa as a portal of entry into the host, and also use secretions such as semen and vaginal fluids as a means of exit and transmission to a new host.