Match the following columns and select the correct option. [2020]
| Column-I | Column-II |
|---|---|
| (A) Bt cotton | (i) Gene therapy |
| (B) Adenosine deaminase deficiency | (ii) Cellular defence |
| (C) RNAi | (iii) Detection of HIV infection |
| (D) PCR | (iv) Bacillus thuringiensis |