Correct Option (b)
Reason : Salmonella typhi causes typhoid fever in human beings. It is characterised by constant fever due to the infection of intestine. Giardia is a flagellate protozoan, lamblia species of this protozoan causes disease giardiasis, a prolonged diarrhoeal disease of humans.
Bacterial genus Shigella causes shigellosis or bacillary dysentery.
Escherichia coli is a facultative anaerobes, found in the intestine of human beings.
Correct Option (b) Reason : Salmonella typhi causes typhoid fever in human beings. It is characterised by constant fever due to the infection of intestine. Giardia is a flagellate protozoan, lamblia species of this protozoan causes disease giardiasis, a prolonged diarrhoeal disease of humans.
Bacterial genus Shigella causes shigellosis or bacillary dysentery.
Escherichia coli is a facultative anaerobes, found in the intestine of human beings.