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B
Spinal cord
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C
Cranial nerves
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D
Spinal nerves
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Solution
The correct option is B Brain The spinal cord is the part of the central nervous system along with the brain. The 12 pairs of cranial nerves are part of the peripheral nervous system and are mostly concentrated with head, neck and facial region of the body (vagus nerve X being the part of autonomous division serves as an exception). Spinal nerves are connected to the spinal cord. Parkinsonism is caused by loss of dopamine neurone due to deficiency of dopamine synthesis and results in disturbed nerve transmission in the upper brain stem