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': 'Which of the following statements is true about Rectal atresia? \nSelect and explain. \nA. Usually a fistula is present with the urethra or bladder, B. Anus is usually normal, C. Stricture of the rectum, D. Common type of anorectal malformation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]