This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Medicine
Hypokalemic periodic paralysis is inherited as an autosomal dominant disorder with incomplete penetrance; it is resulted because of mutation in: 
Select and explain. 
A. Sodium channel, B. Potassium channel, C. Chloride channel, D. Calcium channel
D: Calcium channel
Answer: D: Calcium channel 
Explanation: Ans. D. Calcium channelHypokalemic Periodic Paralysis* Onset occurs at adolescence.* Men are more often affected because of decreased penetrance in women.* Hypokalemic periodic paralysis is inherited as an autosomal dominant disorder with incomplete penetrance.* Mutations in the voltage-sensitive, skeletal muscle calcium channel cause the disease.