Answer:
Parkinson's disease
Step-by-step explanation:
Parkinson's is a progressive degenerative disorder in which neurons are affected in basal ganglia and substantia nigra of brain. These neurons are responsible for producing dopamine transmitter and in Parkinson's they start to die.
Loss of around 80% of dopamine results in the symptoms like Bradykinesia (slow movement, decreased blinking, drooling), stiffness, tremor, balance problem etc. Treatment is done by medication, brain stimulation surgery, exercise and diet.