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" />Plasmodium vivax/ UTI test
Streptococcus pneumoniae/ Widal test
Salmonella typhi/ Anthrone test
Salmonella typhi/ Widal test
Correct option is D. Salmonella typhi/ Widal test. Salmonella typhi is the causative agent. Confirmatory test=Widal test, it's based on antigen antibody reaction. So the correct answer is "Salmonella typhi/ Widal test".