This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycology, Subject name: Microbiology
All are cestodes EXCEPT 
Select and explain. 
A. Treponema pallidum, B. Echinococcus, C. Taenia solium, D. Taenia saginata
A: Treponema pallidum
Answer: A: Treponema pallidum 
Explanation: Ref: Harrisons 19th ed. pg. 1146; table 245e1* Cestodes are helminthes. Example of cestodes:CestodesIntermediate hostDefinitive hostTaenia soliumPigManTaenia saginataBeefManEchinococcus granulosusMan, camels and sheepDogEchinococcus multilocularisRodents and humansFoxes, dogs and catsH. nanaManManD. latumCyclops, fresh water fishManNote: Treponema pallidum is a spirochete