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': 'Villous polyp of rectum manifest - \nSelect and explain. \nA. Bleeding PR, B. Mucus diarrhoea with hypokalemia, C. Prolapse rectum, D. Obstruction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • Villous adenoma causes profuse watery diarrhea and hypokalemia, hyponatremia, hypochloremia and metabolic acidosis.\n• Best treatment: Submucosal resection endoscopically or surgically (Provided cancerous change has been excluded).', 'role': 'assistant'}]