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: Pharmacology
Potassium channel opener ? 
Select and explain. 
A. Stiripentol, B. Retigabine, C. Lacosamide, D. Modafinil
B: Retigabine
Answer: B: Retigabine 
Explanation: Ans. is 'b' i.e., Retigabine[Ref. Epilepsy and brain tumors by Herbe B. Newton, p. 17flPotassium channel openersA potassium channel opener is a type of drug which facilitates ion transmission through Potassium channels.Diazoxide vasodilator used for hypeension, smooth muscle relaxing actIVItyMinoxidil vasodilator used for hypeension, also used to treat hair lossNicorandil vasodilator used to treat anginaPinacidilRetigabine, an anticonvulsantFlupiine, analgesic with muscle relaxant and anticonvulsant propeies