A nurse is reinforcing teaching with a client who is dependent on nicotine and wishes to discontinue smoking. The nurse should inform the client that which of the following is a manifestation of nicotine withdrawal?

The plantar Babinski reflex is assessed by stroking the sole of the foot from the heel towards the toes. A normal response is the flexion or curling of the toes. An abnormal response, known as a positive Babinski sign, is the extension and fanning out of the toes, which indicates an upper motor neuron lesion.

"Place your foot in my hand and I will tap the back of your heel": This instruction is more relevant to testing the Achilles tendon reflex, where the nurse taps the back of the heel to elicit a plantarflexion response.

"Sit on the edge of the bed while I tap your knee": This instruction is more relevant to testing the patellar reflex, also known as the knee-jerk reflex. The nurse taps the patellar tendon just below the kneecap to elicit a reflexive contraction of the quadriceps muscle.

"Relax your arm across your chest and I will test your elbow extension": This instruction is more relevant to testing the triceps reflex, where the nurse taps the triceps tendon to elicit a reflexive extension of the elbow.

When a central venous catheter (CVC) is inserted, it is essential to confirm proper catheter placement to ensure safe and effective administration of TPN and other medications. A chest x-ray is the gold standard method to verify the correct positioning of the CVC tip. It helps determine if the catheter is appropriately positioned in the superior vena cava or another desired location, which minimizes the risk of complications such as pneumothorax or improper medication delivery.

The other options listed are not appropriate actions for the nurse to take in this situation:

1. Verifying the amount of TPN solution the client is receiving every 4 hours is a task related to ongoing monitoring of TPN administration, but it is not directly related to the preparation of the client for CVC insertion.
2. Using clean technique when changing the catheter dressing is not appropriate for CVC insertion. Sterile technique is required during the insertion of a CVC to minimize the risk of infection.
3. Placing the client in Sims' position is not the appropriate position for CVC insertion. The client is typically placed in a supine or Trendelenburg position during the procedure to facilitate access to the central venous system.