Which of the following is not a constituent of nucleic acids?

The number of hydrogen bonds between guanine and cytosine; and between adenine and thymine in $DNA$ is

$DNA$ fingerprinting is a technique used to identify individuals by their genetic makeup. It relies on the fact that the sequence of nucleotides in $DNA$ is unique to every individual,except for identical twins. The process involves isolating $DNA$,fragmenting it using restriction enzymes,separating the fragments via gel electrophoresis,and then using probes to visualize specific patterns ($DNA$ profiles). Uses: $1$. Forensic investigations for solving crimes. $2$. Determining paternity or maternity. $3$. Identifying genetic disorders and hereditary diseases.

If the base sequence in $DNA$ is $TGAACCCTT$,then the base sequence in $RNA$ is.......

Which of the following bases are present both in $DNA$ and $RNA$?

Assertion $(A)$: Adenine and guanine are present in $RNA$ as purine bases.
Reason $(R)$: The base uracil is present in $RNA$.
The correct option among the following is: