Answer: CTAGTG
Explanation: During The synthesis or transcription of the DNA, mRNA molecules is synthesized using the template DNA strand.
The new nucleotides are added to the growing mRNA chain by the help of the enzyme RNA polymerase.
The new added nucleotide are complementary. The complementary base pairing rule binds guanine to cytosine and vice versa, adenine to thiamine and vice versa.