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Trichinella is a parasitic roundworm that can cause a disease known as trichinosis. This disease is transmitted through the consumption of undercooked or raw meat that is infected with the larvae of the parasite. Once ingested, the larvae travel through the digestive system and enter the bloodstream, where they can circulate throughout the body via the circulatory system. This is crucial for understanding how the parasite spreads within the host and causes illness.

In contrast, the other diseases listed are transmitted through different routes. Hepatitis B is primarily transmitted through blood and bodily fluids, but it does not actively move through the circulatory system like Trichinella does in its lifecycle. Listeriosis is caused by Listeria monocytogenes and is typically transmitted through contaminated food, leading to infections that primarily affect vulnerable populations, but do not involve the circulatory system in the same way. Salmonellosis, caused by Salmonella bacteria, is primarily transmitted through ingestion of contaminated food or water, and while it can enter the bloodstream in severe cases, the main transmission route is different from how Trichinella operates.

Thus, Trichinella's lifecycle and transmission directly correlates to the circulatory system, making it the correct choice