Final answer:
The nurse should ask the elderly client with CAD if they get yearly CXRs to monitor their condition and detect any changes or complications related to CAD.
Step-by-step explanation:
The nurse should ask the elderly client with CAD the question: 'Do you get yearly CXRs?' This is an important question because regular Chest X-rays (CXR) can help monitor the client's condition and detect any changes or complications related to their coronary artery disease (CAD).