The spread of ______ is (are) encouraged when uncooked garbage is fed to hogs.

Feeding uncooked garbage to hogs can lead to the spread of various diseases, making the option encompassing all potential diseases the most appropriate choice.

Trichinosis is a disease caused by a parasitic infection from consuming raw or undercooked meat infected with Trichinella larvae, which can originate from hogs that have eaten garbage containing the larvae. This highlights the health risks associated with improper feeding practices.

Hog cholera is a viral disease that affects pigs and can be exacerbated by feeding them contaminated garbage. The feed can introduce the virus into a herd, making it a significant public health concern.

Vesicular exanthema is a viral disease that also affects swine, and similar to hog cholera, can spread through contaminated materials, including uncooked garbage.

By choosing the option that includes all of these diseases, it highlights the importance of safe feeding practices for pigs to prevent serious health implications for both the animals and humans who may consume pork products. This signifies a critical point in food safety and animal husbandry, illustrating the interconnectedness of animal health and public health.