Correct Answer: B
Solution :Salmonella typhi causes typhoid fever in human beings. It is characterized by constant fever due to infection of intestine. Giardia is a flagellate protozoan, lamblia species of this protozoan causes disease giardiasis, a prolonged diarrheal disease of humans. Bacterial genus Shigella causes shigellosis or bacillary dysentery. Escherichia coli is a facultative anaerobes, found in the intestine of human beings.
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