A client receives gentamicin 500 mg every 8 hours IV for a leg infection. The nurse touches the client's shoulder when there is no response to a greeting. The client jumps and acts startled. Which action by the nurse is most important?
A) Ask what the client is thinking.
B) Monitor the color and sensation in the client's leg.
C) Obtain the client's temperature, pulse, and blood pressure.
D) Check the client for tinnitus and hearing loss.