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
[{'content': "All of the following are neurologic channelopathies except - \nSelect and explain. \nA. Hypokalemic periodic paralysis, B. Episodic ataxias, C. Familial hemiplegic migraine, D. Huntington's disease", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]