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
Which of the following does not have non-human reservoir 
Select and explain. 
A. Salmonella typhi, B. Yersinia pestis, C. Escherichia coli, D. Clostridium tetani
A: Salmonella typhi
Answer: A: Salmonella typhi 
Explanation: Man is the only natural host for S.typhi and S.paratyphi A whereas most of the other salmonella are chiefly pathogenic in an animal. Clostridium, E.coli and yersinia infect both human and animal. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition