Final answer:
The sign that is not part of the Cincinnati Prehospital Stroke Scale is abnormality.
Step-by-step explanation:
The Cincinnati Prehospital Stroke Scale is used to quickly assess and identify potential stroke symptoms. The signs of stroke are abbreviated as FAST, where F stands for facial droop, A stands for arm drift, S stands for slurred speech, and T stands for time to call 911. Therefore, the correct answer to the question is abnormality (option c), as it is not part of the Cincinnati Prehospital Stroke Scale.