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: Physiology
[{'content': 'Inability to perform rapid alternating movement is - \nSelect and explain. \nA. Past-pointing, B. Dysdiadochokinesia, C. Dysmetria, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dysdiadochokinesia: Inability to perform rhythmic, rapidly alternating movements like pronation and supination.\nPast-pointing (overshoot): Failure to stop a movement at an appropriate time.\nDysmetria: Errors in the range and force of movement, which may be due to past-pointing.', 'role': 'assistant'}]