This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal obstruction, Subject name: Surgery
[{'content': 'Which of the following is not a feature of paralytic ileus? \nSelect and explain. \nA. Hypoactive bowel sounds, B. Presence of gas in rectum, C. Colicky pain, D. Dilated bowel loops with multiple air fluid levels on X-ray', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Paralytic ileus Failure of transmission of peristaltic waves due to neuromuscular failure. Etiology: Abd Sx Intra-abdominal infection Dyselectrolytemia Drugs Clinical presentation Abdominal distention Vomiting Dilated bowel loops No mechanical obstruction Paralytic ileus Mechanical obstruction Pain is not a feature of paralytic ileus and if present a steady, diffuse discomfo Bowel sounds are hypoactive or absent Presence of gas in colon & rectum in paralytic ileus on abdominal X-ray Pain is colicky in mechanical obstruction Hyperactive bowel sounds in mechanical obstruction Absence of gas in colon & rectum in mechanical (complete) small bowel obstruction', 'role': 'assistant'}]