This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Paralytic ileus caused by 
Select and explain. 
A. Hypokalemia, B. Hypoglycemia, C. Hyperkalemia, D. Hypercalcemia
A: Hypokalemia
Answer: A: Hypokalemia 
Explanation: Hypokalemia leads to decreased smooth muscle contraction leading to decreased peristalsis and thus paralytic ileus. Pg NO.1296 BAILEY 27TH EDITION