What condition is indicated by a stroke?

A stroke occurs when there's a lack of blood flow to the brain, which is precisely what option B describes. This insufficient blood flow results in a deprivation of oxygen and nutrients, leading to brain cell damage or death. There are two primary types of strokes: ischemic, caused by a blockage in a blood vessel supplying blood to the brain, and hemorrhagic, caused by a burst blood vessel. Both types disrupt normal circulation, which is critical for brain function. Understanding that a stroke is fundamentally a blood flow issue helps to recognize the acute medical nature of the condition and the urgency required in response to stroke symptoms.