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: Pediatrics
[{'content': "All of the following may occur in Down's syndrome except- \nSelect and explain. \nA. Hypothyroidism, B. Undescended testis, C. Ventricular septa! defect, D. Brushfield's spots", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b i.e., Undescended testis Undescended testis has not been described as an association with Down's syndrome.", 'role': 'assistant'}]