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
All of the following may occur in own's syndrome except – 
Select and explain. 
A. Hypothyroidism, B. Undescended testis, C. Ventricular septal defect, D. Brushfield's spots
B: Undescended testis
Answer: B: Undescended testis 
Explanation: Undescended testis has not been described as an association with Down's syndrome.