‘Pathogens' were discovered by

Malaria is caused by

$A$ - Smoking is associated with increased incidence of cancer of lung

$R$ - It increase $CO$ content in blood and reduce the concentration of haembound oxygen

 Give scientific reasons : Hepatitis $B$ and Bird flu $DNA$ vaccines are called Recombinant $DNA$ vaccines.

Infantile amaurotic idiocy $(Tay-Sachs disease)$ is

Which of the following pairs are not viral diseases?