This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pharmacology
Triamterene causes: 
Select and explain. 
A. Hypokalemia, B. Muscle cramps, C. Decrease in urea level, D. Better glucose tolerance
B: Muscle cramps
Answer: B: Muscle cramps 
Explanation: Inhibitors of renal epithelial sodium channel - Triamterene, Amiloride Side effects are - nausea, vomiting, rash, headache, dizziness, constipation, low blood pressure, muscle cramps, hypersensitivity, pancreatitis, and jaundice, electrolyte disturbances ( Essentials of Medical Pharmacology, K.D Tripathi,6th edition, page 571)