Please answer the following question: Caffeine is a central nervous system stimulant, and caffeine is a stimulant, and a stimulant constricts blood vessels. Given these facts, what does caffeine do to blood vessels among the following options: - It expands - looseness - hydrate their cells - Constrict them - sweating - Dehydration - They may not survive. - Damages them
A:
Constrict them