This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluids & Electrolyte Disorders - Electrolyte Concentrations, Subject name: Surgery
[{'content': 'Most common electrolyte imbalance that causes Paralytic ileus is? \nSelect and explain. \nA. Hyponatremia, B. Hypernatremia, C. Hypokalemia, D. Hyperkalemia', 'role': 'user'}, {'content': "Answer: C \nExplanation: ANSWER: (C) HypokalemiaREF: With textParalytic ileus can develop as a result of trauma, toxemia, peritonitis, electrolyte deficiency (especially hypokalemia), or the use of certain drugs, such as pain medications, ganglionic blockers, or anticholinergics (Ref: SRB Manual of Surgery 4th ed page 1000, Understanding Diseases Lippincott Williams & Wilkin Page 328Paralytic effects of hypokalemia on intestinal smooth muscle may cause intestinal ileus. (Ref Harrison 18th ed chapter 45)Gastroenteritis is the most common cause of a paralytic ileus. Leading pharmacological cause of paralytic ileus is Narcotic use. (Ref: Review' for USMLE: United States Medical Licensing Examination Step 3 by Mitchell H. Rosner page 286)", 'role': 'assistant'}]