Which of These Compounds is a 6-Membered Heterocyclic Aromatic Ring

Question

Which of these compounds is a 6-membered heterocyclic aromatic ring?
A)pyrimidine
B)purine
C)anose
D)ribonucleotide

Accepted Answer

Pyrimidine is a heterocyclic aromatic compound with a 6-membered ring containing two nitrogen atoms. Purine is also a heterocyclic aromatic compound, but it contains a 5-membered ring fused to a 6-membered ring. Anose and ribonucleotide are not heterocyclic aromatic compounds.