Directions : These questions consist of two statements each printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses 

Assertion: One end of a massless rod of length l is hinged, so that it is free to rotate in a vertical plane about a horizontal axis. If a particle is attached to the other end of the rod, then the minimum speed at  lower most position of the particle is $\sqrt{5gl}$ to
complete the circular motion. 
Reason : Work done by centripetal force on the particle is always zero.

• A

  If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

• B

   If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

• C

  If Assertion is correct but Reason is incorrect.

• D

   If Assertion is incorrect but Reason is correct.