This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following does not have non-human reservoir -a)  Salmonella typhib)  N. Gonorrhoeac)  E colid)  Clostridium tetani e)  Treponema pallidum \nSelect and explain. \nA. ed, B. dca, C. abe, D. ac', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]