Given below are two statements. One is labelled as Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$.

Assertion $\mathrm{A}$ : Amylose is insoluble in water.

Reason $\mathrm{R}$ : Amylose is a long linear molecule with more than $200$ glucose units.

In the light of the above statements, choose the correct answer from the options given below.

• A

  Both $\mathrm{A}$ and $\mathrm{R}$ are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$.
• B

  Both $\mathrm{A}$ and $\mathrm{R}$ are correct and $\mathrm{R}$ is NOT the correct explanation of $\mathrm{A}$.
• C

  $\mathrm{A}$ is correct but $\mathrm{R}$ is not correct.
• Correct answer
  D

  $\mathrm{A}$ is not correct but $\mathrm{R}$ is correct.

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