Final answer:
A stress test is contraindicated in acute cardiovascular diseases (MI, unstable angina, or heart failure).
Step-by-step explanation:
A stress test is contraindicated in acute cardiovascular diseases (MI, unstable angina, or heart failure). This means that a stress test should not be performed on individuals who are currently experiencing these conditions. A stress test involves physical exertion that can put additional strain on the heart, which may be dangerous for individuals with acute cardiovascular diseases.