| List-I (Scientist) | List-II (Contribution) |
| (A) A. Jeffreys | (I) Nuclein |
| (B) Miescher | (II) Amino acid formation |
| (C) J. Monod | (III) DNA fingerprinting |
| (D) S.L. Miller | (IV) Transcriptionally regulated system |
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)