The causative agent of tuberculosis is

Cholera, leprosy, and diphtheria are:

Which organism is responsible for pneumonia?

What is the causative agent of plague?

Typhoid is spread by . . . . . . .

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