Terrance Went to the Dentist and Was Given Some Novocain

Multiple Choice

 Terrance went to the dentist and was given some Novocain. This prevented him from feeling pain because the drug ____.

A) attached to sodium channels letting in sodium and stopping the action potential from sending a pain message
B) attached to potassium channels letting in potassium and stopping the action potential from sending a pain message
C) attached to potassium channels blocking potassium from entering and stopping the action potential from sending a pain message
D) attached to sodium channels blocking sodium from entering and stopping the action potential from sending a pain message