The test for ‘syphilis' was developed by

Drugs that cause malformation in embryo during pregnancy are called

Eradication of smallpox has been possible due to the following facts except

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

Entamoeba gingivalis lives in the

Ribosomes of cancerous cells fuse together to form