Typically Cardiac arrest is "Has no heart beat" hence cardiac only refers to the heart. But it ciuld be a trick question because in a cardiac arrest the person is not breathing and is unconscious as well. But i would go with "Has no hearbeat"
Answer: Every postoperative patient's priority is pain management.
Explanation: In this particular case there are other priority's involved:
1. Use of compression devices to prevent Deep Vein Thrombosis or Pulmonary Thromboembolism, to which Orthopaedic Surgery patients are susceptible to.
2. Position changes to prevent pressure ulcers, especially in this case in which it is an old woman, with a physical limitation to move herself.
The cerebellum is in control of coordination, movement, and balance, so it's the cerebellum.