Which of the following is a result of too little dopamine in the brain?
traumatic brain injury
huntington's disease
parkinson's disease
alzheimer's disease

Parkinson's disease

Explanation:

The main disease associated with low brain dopamine is Parkinson's disease. In this degenerative condition, production in the 'substantia nigra of the brain stem' (the region of the brain in which it acts) decays rapidly, resulting in impaired communication of neurons responsible for motor system modulation.

One of the functions of dopamine is to control voluntary movements, thus its deficiency leads to the difficulty of movement characteristic of Parkinson, which is marked by stiffness and tremors.

answer (c) by causing social withdrawal;