Widal test is carried out to test

Which bacteria are responsible for pneumonia?
$(i)$ $Streptococcus$ $typhi$
$(ii)$ $Haemophilus$ $influenzae$
$(iii)$ $Streptococcus$ $pneumoniae$
$(iv)$ $Haemophilus$ $typhi$

Which is the cause of Anthrax disease?

Which of the following is $NOT$ a symptom of pneumonia?

Which of the following matches is correct?
Disease - Pathogen

$Salmonella$ $typhi$ are . . . . . . bacteria.