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
Which of the following is an adverse effects of beta-2-agonist? 
Select and explain. 
A. Hypoglycemia, B. Hypomegnesemia, C. Hypophosphatemia, D. Hypokalemia
D: Hypokalemia
Answer: D: Hypokalemia 
Explanation: Hypokalemia. Beta-2-agonist causes a brief spell of hyperkalemia followed by hypokalemia. Doesn't causes hypoglycemia, however delays the recovery from hypoglycemia.