Assertion : The heterocyclic compounds in nucleic acid are the nitrogenous bases.
Reason : Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.

A : If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
B: If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
C : If Assertion is true but the Reason is false.
D :If both Assertion and Reason are false.

Answer

C

Explanation

Nucleic acids are polynucleotides. A nucleotide has three chemically distinct components. One is a heterocyclic compound, the second is a monosaccharide and the third a phosphoric acid or phosphate. The heterocyclic compounds in nucleic acids are the nitrogenous bases named adenine, guanine, uracil, cytosine and thymine. Adenine and guanine are substituted purines while the rest are substituted pyrimidines formed from the skeletal heterocyclic rings purine and pyrimidine, respectively.