This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Channelopathies and Neuropathies, 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: Choice 1 and 3 are calcium channel defect. Choice 2 is potassium channel defect. Huntington' disease is a disorder of trinucleotide repeats due to Huntington gene on chromosome 4.", 'role': 'assistant'}]