What is antisense technology?

What is antisense technology?

(1) RNA polymerase producing DNA
(2) A cell displaying a foreign antigen used for synthesis of antigens
(3) Production of somaclonal variants in tissue cultures
(4) When a piece of RNA that is complementary in sequence is used to stop expression of
a specific gene

Sol. Answer (4)
Antisense technology is the translational control of protein synthesis which involves use
of RNA which is complemantry to m-RNA, inhibiting the expression of genes.