A) Russia
B) Germany
C) USA
D) France
Correct Answer: C
Solution :
[c] AIDS (Acquired Immune Deficiency Syndrome) was first noticed in USA in 1981. It is the disorder of cell mediated immune system of the body. There is a reduction in the number of helper T-cells, which stimulate antibody production by\[\beta --cells\]. This results in the loss of natural defence against viral infection.
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