Statement $I$: Collecting duct of kidney extends from the cortex to the inner parts of medulla.
Statement $II$: Large amount of water could be reabsorbed from collecting duct to form a concentrated urine.

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