Off topic:RNA Molecule folding

Question

[anasjamshed]

For a Single Stranded RNA Molecule :

A) Adenine Content Always Equals to Thymine Content B) Cytosine content Equals to Guanine content C) Adenine content Always Equal to Uracil D) Guanine content Does not necessarily equals to its Cytosine Content

I assume that C would be the right answer but my teacher said the answer would be D . Plz help me n this typical question