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': 'The patent vitello-intestinal duct most often discharges - \nSelect and explain. \nA. Mucus, B. Pus, C. Urine, D. Faeces', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]