The relative percentages of nitrogenous bases of the genetic material isolated from various species ( $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}$ and T) are listed in the following table.
$\begin{array}{|c|c|c|c|c|c|}<br>\hline \text { Species } & \text { Adenine } & \text { Guanine } & \text { Thymine } & \text { Cytosine } & \text { Uracil } \\ \hline \text { P } & 21 & 29 & 21 & 29 & 0 \\ \hline \text { Q } & 29 & 21 & 29 & 21 & 0 \\ \hline \text { R } & 21 & 21 & 29 & 29 & 0 \\ \hline \text { S } & 21 & 29 & 0 & 29 & 21 \\ \hline \text { T } & 21 & 29 & 0 & 21 & 29 \\ \hline<br>\end{array}$

Choose the correct statement from the following.

• A

  Species P, Q and R contain single-stranded DNA; S and T cannot contain double-stranded RNA.
• B

  Species P, Q and R contain double-stranded RNA; species S and T contain single-stranded RNA.
• C

  Species P, Q and R cannot contain single-stranded DNA; species S contains single-stranded RNA; species T contains double-stranded RNA.
• Correct answer
  D

  Species P and Q contain double-stranded DNA; species R contains singlestranded DNA; species S contains double-stranded RNA; species T contains single-stranded RNA.

Hence, the correct answer is option: 'D'.