Final answer:
The nurse should explain that even though the chest pain has subsided, the client is still at risk and needs rest to allow the heart to heal after the MI.
Step-by-step explanation:
The nurse's best response would be: "Just because your chest doesn't hurt anymore doesn't mean you are out of danger."
This response emphasizes that even though the client's chest pain has subsided, it doesn't mean that they are completely recovered from the myocardial infarction (MI) or heart attack. It is important for the client to understand that rest and taking it easy is necessary because their heart is damaged and needs time to heal. This healing process typically takes about 4-6 weeks.