<s>[INST] What is a stroke or brain attack? [/INST] A stroke, recently termed “brain attack,” occurs when the blood supply to a portion of the brain is interrupted. This interruption of the blood supply interferes with the normal functioning of brain cells in that area. Cessation of normal functioning of brain cells results in symptoms such as arm and/or leg weakness, disturbed speech or comprehension of spoken speech, numbness, visual disturbance or other symptoms. Source: STROKE SUPPORT ASSOCIATION. Link: https://strokesupportassoc.org/about-stroke/faq/. Field: Neurology. Disease: Stroke </s>