Answer: The correct answer is -
A) CO2.
Nucleus is a membrane bound specialised organelle that is present in the eukaryotes. It contains the genetic material of living organisms that is DNA( deoxyribonucleic acid).
Genetic message is transferred from nucleus to ribosomes in the form of mRNA (messenger RNA) after DNA is converted to mRNA through transcription that takes place in the nucleus.
CO2 (carbon dioxide) is not involved in the transfer of a genetic message from the nucleus to the ribosome.
Thus, option A is the right answer.