Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

(a) Thymine, Uracil         - Pyrimidines

(b) Uracil, Cytosine         - Pyrimidines

(c) Guanine, Adenine      - Purines

(d) Adenine, Thymine     - Purines

(d) DNA and RNA the principle genetic materials of living organisms are chemically called nucleic acids. These are polymers of nucleotides. Each nucleotide is composed of phosphoric acid, pentose sugar and a nitrogenous base. The nitrogenous bases are of two types, i.e., purines and pyrimidines.   

Purines are heterocyclic and two rings compound, eg, adenine, guanine.

Pyrimidines are single ring compound, eg, thymine, cytosine, uracil.

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