In which of the following diseases is there typically a deficiency in dopamine?

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Parkinson's disease is a neurodegenerative disorder that is characterized by a loss of dopamine-producing neurons in the substantia nigra region of the brain. This results in a deficiency of dopamine, which is a neurotransmitter that plays a critical role in regulating movement, among other functions. The loss of dopamine leads to the characteristic symptoms of Parkinson's, including tremors, rigidity, and bradykinesia (slowness of movement).

In Which of the Following Diseases Is There Typically a Deficiency