The host of Taenia Solium is _________

Analyze the question: It asks about the host of Taenia solium, the pork tapeworm. Note that tapeworms often have two hosts: a definitive host and an intermediate host.

Explain the concept:

• The definitive (primary) host is where the adult worm lives and reproduces. For Taenia solium, this is humans, whose intestines house the adult tapeworm.
• The intermediate host is where the larval stage (cysticercus or "bladder worm") develops. For Taenia solium, this is the pig. The word solium is linked to pork, which is why it is called the "pork tapeworm".
• By comparison, Taenia saginata (the beef tapeworm) uses the cow as its intermediate host.

Step by step:

1. Humans are the definitive host, but "human" is not among the options.
2. Among the options, the animal linked to Taenia solium is the pig, its intermediate host.
3. The cow (A) belongs to Taenia saginata. Sheep (C) and dog (D) are associated with other tapeworms, such as Echinococcus, which uses dogs as its definitive host.
4. So the best answer is B, pig.

Tip: Match the worm to its meat:

• solium → swine/pork → pig
• saginata → beef → cow

Humans get infected by eating undercooked, infected meat containing the larval cysts.