This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': 'Hung up knee jerk is seen in: \nSelect and explain. \nA. Chorea, B. Cerebral palsy, C. Athetosis, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: aRef: Dr Arup Kundu, 3rd ed, p. 414', 'role': 'assistant'}]