This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy 1, Subject name: Anatomy
The marked structure is involved in which pathology 
Select and explain. 
A. Dementia, B. Alzheimer, C. Paralysis agitans, D. Chorea
C: Paralysis agitans
Answer: C: Paralysis agitans 
Explanation: Marked structure is substantia nigra of brain (dark due to neuro melanin) (in mid-brain) Produce dopamine Lesion +- dopamine decreases - resulting in parkinson's disease / paralysis agitans.