This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Microbiology
[{'content': 'All of the following are sexually transmitted, except \nSelect and explain. \nA. Candida albicans, B. Echinococcus, C. Molluscum contagiosum, D. Treponema pallidum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Echinococcus granulosus is dog tapeworm. It is not an STD. Trichomonas is the only parasite causing STD. Molluscum contagiosum is a virus causing STD, whereas candida albicans is a fungus causing STD and T.pallidum is a bacteria causing STD Ref: Ananthanarayan& Paniker&;s textbook of microbiology, 9th edition.', 'role': 'assistant'}]