The person chronically abusing drugs runs the risk of mental impairment. The area of the brain which can be affected and be permanently damaged is the:

A. limbic system The limbic system is involved in emotion and reward, and is affected by addiction, but not primarily linked to cognitive impairment. B. cerebellum Involved in motor control and coordination, not majorly in cognition. C. cerebrum The cerebrum controls higher cognitive functions, including judgment, memory, decision-making, and is most affected in long-term drug abuse. D. brain stem Regulates basic life functions like breathing and heart rate. While vital, it is less involved in cognitive impairment from drug abuse.