What is the source of $L$-Lactic acid from the following?

The carbohydrate present in $DNA$ is $2$-deoxy-$D$-ribose. Which of the following statements are correct regarding this sugar?
$A.$ It is a pentose sugar.
$B.$ It is present in pyranose form.
$C.$ It is in $D$-configuration.
$D.$ It is a reducing sugar when free.
$E.$ It is in $\alpha$-anomeric form.
Choose the correct answer from the options given below:

$\alpha-D$-glucose and $\beta-D$-glucose differ from each other due to the difference in the configuration of their carbon atom at:

When sugar $X$ is boiled with dilute $H_{2}SO_{4}$ in an alcoholic solution,two isomers $A$ and $B$ are formed. $A$ on oxidation with $HNO_{3}$ yields saccharic acid,whereas $B$ is laevorotatory. The compound $X$ is ....... .

Given below are two statements :
Statement $I :$ $D$-glucose pentaacetate does not react with $2,4$-dinitrophenylhydrazine.
Statement $II :$ Starch,on heating with dilute sulfuric acid at $393 \ K$ and $2-3 \ \text{atmosphere}$ pressure,produces glucose.
In the light of the above statements,choose the correct answer from the options given below.

$D$-Mannose $\overset{HO^{-}}{\longleftrightarrow}$ $D$-Glucose $\overset{HO^{-}}{\longleftrightarrow}$ $(A)$.
Product $(A)$ of the above reaction is: