Which of the following is an example of a parasite that can cause foodborne illness?

Trichinella is indeed an example of a parasite that can cause foodborne illness. This nematode is typically associated with undercooked or raw pork products, where it infects the host and can lead to a condition known as trichinosis. When humans consume pork that contains the encysted larvae of Trichinella, the larvae are released in the intestines, mature into adult worms, and can lead to various symptoms ranging from gastrointestinal upset to more severe systemic effects, including muscle pain and inflammation.

In contrast, the other options listed are all examples of bacteria, not parasites. Listeria is a bacterium linked to contaminated deli meats and unpasteurized dairy products and can lead to listeriosis. Salmonella is another bacterial pathogen commonly found in raw poultry, eggs, and other food items, causing severe gastroenteritis. Clostridium species, such as Clostridium perfringens or Clostridium botulinum, are also bacteria associated with foodborne illness, involving the production of toxins affecting the gastrointestinal tract or causing more severe conditions like botulism. Understanding the nature of these pathogens helps in food safety practices and prevention of foodborne illnesses.