Statement-$I$: Fibres of the tracts are covered with the myelin sheath,which constitute the outer part of the cerebral hemisphere.
Statement-$II$: The hypothalamus contains a number of centres which control body temperature,urge for eating and drinking. In the light of the above statements,choose the most appropriate answer from the options given below:

• A
  Both statement-$I$ and statement-$II$ are correct.
• B
  Statement-$I$ is correct but statement-$II$ is incorrect.
• C
  Both statement-$I$ and statement-$II$ are incorrect.
• D
  Statement-$I$ is incorrect but statement-$II$ is correct.