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: Surgery
[{'content': 'Resting Tone of Rectum is decreased in all except \nSelect and explain. \nA. Micturation, B. Retained feaces in the rectum, C. Prolapse rectum, D. Trauma involving the perineum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]