The cells which suppress the entire immune system from its attack in the same body are known as
Helper $T$-cells
Killer $B$-cells
Suppressor cells
Suppressor $T$-cells
Thalidomide is a non-barbiturate sedative drug which was to be given to pregnant women. Its use was withdrawn in $1961$ because it resulted in phocomelia. This condition illustrates
Match the incorrect pair
After infection of germs immunity acquired is
Polio immunizing vaccine was developed by
$ECT$ is