Of the Five Bases Found in Nucleic Acids, Which Are

Of the five bases found in nucleic acids, which are purines and which are pyrimidines?

A) Pyrimidines = thymine and uracil : Purines = cytosine, adenine and guanosine
B) Pyrimidines = cytosine, adenine and guanosine: Purines = thymine, and uracil
C) Pyrimidines = cytosine, thymine and uracil : Purines = adenine and guanosine
D) Pyrimidines = cytosine and uracil : Purines = adenine, thymine and guanosine
E) Pyrimidines = adenine and guanosine: Purines = cytosine, thymine, and uracil