The phenomenon that led to the discovery of penicillin involves

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 Its use was withdrawn in $1961$ because it resulted in phocomelia.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

AIDS related complex $(ARC)$ is a disease which leads to fever, swollen lymph nodes, night sweats, loss in weight etc. represents

Which of the following disease is due to an allergic reaction