Which of the following is a sign of a stroke?

Facial drooping is a classic sign of a stroke, often resulting from the sudden loss of blood flow to part of the brain, which can affect muscle control in the face. When a stroke occurs, one side of the face may droop or feel numb, making it difficult for the individual to smile or show facial expressions evenly. This symptom is associated with the specific area of the brain that controls facial muscles, and its presence can be a strong indicator of a cerebrovascular accident (CVA).

Each of the other options can also be associated with a stroke or other neurological issues; however, facial drooping is particularly distinctive and is part of the "FAST" acronym used in stroke awareness (Face, Arms, Speech, Time). This makes it not only a key indicator but also a critical sign to recognize as part of the urgent approach needed for potential stroke victims.