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': 'All are features of congenital megacolon except - \nSelect and explain. \nA. Large bulky stools, B. Tight anal ring, C. Pseudodiarrhoea, D. Failure to thrive', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]