Final answer:
A stroke is often caused by a blood clot in an artery supplying blood to the brain.
Step-by-step explanation:
A stroke is often caused by a blood clot. When a blood clot forms in an artery supplying blood to the brain, it can block the blood flow and lead to a stroke. This type of stroke is called an ischemic stroke and is the most common type, accounting for about 87% of all strokes.
Learn more about Causes of stroke