All of the following are neurologic channelopathies, except?: (A) Hypokalemic periodic paralysis, (B) Episodic ataxias, (C) Familial hemiplegic migraine, (D) Huntington's disease
Answer is D. 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.