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# AIDS is due to

$\begin{array}{1 1}(A)\;\text{Reduction in number of helper T-cells}\\(B)\;\text{Reduction in number of killer T-cells}\\(C)\;\text{Autoimmunity}\\(D)\;\text{Non-production of interferons}\end{array}$

AIDS is due to reduction in number of helper T-cells
Hence (A) is the correct answer.