Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'GMP 5'-end residue'?

A. A canonical ribonucleotide residue derived from IMP.
B. A canonical ribonucleotide residue derived from cytidine 5'-monophosphate
C. A canonical ribonucleotide residue derived from adenosine 5'-monophosphate.
D. The 5'-end bound-monomer of a guanylyl-5'-monophosphoric acid that is part of a nucleic acid.

Answer: The 5'-end bound-monomer of a guanylyl-5'-monophosphoric acid that is part of a nucleic acid.