Quinine used for treatment of malarial fever, is extracted form

Malaria fever coincides with liberation of

Main barrier which prevents the entry of disease's causing organism in our body is

Which of the disease is not transmitted by house flies

$A$ : It is considered advantageous to give the polio vaccine orally.
$R$ : It prevents reinfection by causing intestinal immunity

A metastatic cancerous tumour is termed ’sarcoma ' if the disorder is in