In most cities of India,what are the majority of children suffering from?

Which types of narcotic substances can be obtained from the parts of the leaf or flower shown in the figure?

Match the following columns and select the correct option:

Column-$I$	Column-$II$
$(i)$ Typhoid	$(a)$ Haemophilus influenzae
$(ii)$ Malaria	$(b)$ Wuchereria bancrofti
$(iii)$ Pneumonia	$(c)$ Plasmodium vivax
$(iv)$ Filariasis	$(d)$ Salmonella typhi

Read the following sentences and choose the correct sentences:
$1.$ Dysentery,plague,and diphtheria are caused by bacteria.
$2.$ $Salmonella$ $typhi$ directly affects the respiratory system.
$3.$ Amoebiasis and Ascariasis are caused by contaminated water.
$4.$ Internal bleeding,anemia,and muscular pain are symptoms of elephantiasis.

What can be diagnosed by the $ELISA$ test?

Which one of the following pairs of diseases can spread through blood transfusion?