Which of the following illnesses is caused by a deficiency of the neurotransmitter dopamine in the brain?

A) phenylketonuria (PKU)
B) Parkinson's disease
C) stroke
D) Korsakoff's syndrome

Dopamine

A neurotransmitter in the brain that plays a key role in regulating mood, reward, and movement, often associated with the brain's pleasure and reward system.

Parkinson's Disease

A progressive neurological disorder that affects movement, causing tremors, stiffness, and difficulty with walking, balance, and coordination.