Which of the following diagrams represents an insulator 
Definitions:
Stress Test
A medical test that assesses how the heart works under physical stress, often involving exercise or medication that mimics exercise on the heart.
PET Scan
A diagnostic imaging test using a radioactive substance to view organs and tissues inside the body to detect diseases.
Metabolic Activity
The chemical processes occurring within a living organism in order to maintain life, which include anabolism and catabolism.
Neurological Disorders
A broad range of conditions that affect the nervous system, including the brain and nerves, causing various functional disruptions.
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