Chronic Abuse of Methamphetamine Reduces the Number of Dopamine Transporters

Chronic abuse of methamphetamine reduces the number of dopamine transporters in the brain, which may explain why these addicts

A) are rarely overweight.
B) develop depression while using this drug.
C) are more prone to develop Parkinson's disease as they age.
D) move on to "harder" drugs as they get older.
E) are less prone to Parkinson's disease as they age.