A patient who presents to the hospital with severe headaches develops convulsions and dies. At autopsy the brain grossly has a "Swiss cheese" appearance due to the presence of numerous small cysts containing milky fluid. Microscopically, a scolex with hooklets is found within one of these cysts. What is the causative agent for this disease?
Taenia saginata Taenia solium Diphyllobothrium latum Echinococcus granulosa