This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Corticobasal degeneration is characterized by all except 
Select and explain. 
A. Frontoparietal cortical atrophy, B. Symmetric, C. Late onset, D. Limb apraxia
B: Symmetric
Answer: B: Symmetric 
Explanation: Corticobasal degeneration is atypical parkinson's disease. Atypical parkinson's disease is generally symmetric in nature except for corticobasal degeneration.